Pilot Delful Double Knock Mechanical Pencil - 0.5 mm - Black & Green

Pilot Delful Double Knock Mechanical Pencil - 0.5 mm - Black & Green

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4.6 (30 reviews)
DescriptionSpecificationsQuestions & Answers
Check out this new retractable shaker mechanical pencil from Pilot! The pencil tip of this body can conveniently retract to protect the pencil tip, pockets and pencil cases from damage. Just push firmly on the top cap button to extend and retract the tip. When the tip is extended, you can shake the pencil to extend lead or click the top button. Pressing the cap firmly retracts the tip. The pencil body has a colored window that shows the two writing states, the off state "Deru" which means "to come out" and the on state "Furu" which means it is ready to "shake". Refillable with the Pilot HERFN-10 eraser.

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Customer Reviews

I am writing this review...
August 16, 2013
Verified Purchase
I am writing this review to discuss how this pencil is at one particular task: doing math. I study a lot of math in my spare time in preparation to eventually go to graduate school for math. I have filled hundreds of notebook pages with equations and calculations over the past several months using a variety of pencils, but I always seem to come back to the Pilot Delful Double Knock pencil.

Being left-handed, it is hard to a find a pencil that is comfortable and forgiving while keeping my work neat. Yet there is something about the weight balance of this pencil that makes it incredibly comfortable to do hours of calculations without any fatigue. I like to hold my pencil very close to the tip and the rubber grip extends farther than most pencils making it comfortable to hold without slipping. I find that my numbers, fraction lines, and symbols come out looking neater with this pencil compared to other pencils, maybe due to its wider grip.

The shaker mechanism is excellent and extends the perfect amount of lead with two shakes. This pencil makes a great combination with a high quality softer lead like 2B or 3B for crisp, dark numbers because the lead is so easy to advance. As for the retractable tip, I don't use this feature often as I just leave the pencil on my desk when not in use, but I imagine it would be useful when taking the pencil with you. I also don't use the traditional lead advance very often, but it's nice to know that there is a backup in case the shaker mechanism fails. But honestly, if that happens I will probably just order a replacement Delful as I like the shaker mechanism so much.

I recommend this pencil to anyone wanting a quality reliable pencil for doing math or physical sciences with lots of pencil and paper calculations involved. I have used the original Uni Kuru Toga, the Kuru Toga Roulette Model, the Pentel Smash, the Alpha Gel HD Shaka, and the Pilot Opt I and Opt II pencils and I keep going back to this one. I love this pencil.

-perfect weight balance (slightly tip-heavy)
-firm rubber grip
-excellent shaker mechanism
-wide body for more comfort
-writes very smoothly
-holds plenty of lead
-good eraser
-very durable
-excellent value for price

-limited color variety (black with orange would be nice)
-the eraser cover is easy to lose
-doesn't love me back
7 people found this helpful
This pencil is a must...
October 3, 2010
This pencil is a must buy it has every thing. It its a shaker pencil and it has an on and off for putting in new lead. Another pro is how perfectly its wheighted for writing. I like writing in a thin line and this pencil is perfect for the neat freak because it wont get writing on the bottom of your pencil case. All my other pencils are more thick. This one is thin and perfect for writing essays. The price is great too for a whopping 7.50$ it's a must buy. I have used obly this pencil for a 2 month's now.
4 people found this helpful
Love this line of pencils....
March 22, 2013
Verified Purchase
Love this line of pencils. Picked up one right away when there were only a couple of colors and quickly added more once more variations became available.

I agree with all of the other reviews so no need to repeat them, but do have a solution that works for me for those complaining of the lead extending when closing the pencil down.

When I am ready to put it away, I first push down the cap enough to extend the lead, then without releasing, I push the lead all the way in (as with a regular lead pencil), then with the same motion, continue to press the cap to activate the double action which will allow the pencil to close without any lead extended.
2 people found this helpful
I like the...
December 8, 2011
I like the looks, but there are only a few small problems I had: After you shake to advance the lead, it goes back into the tip slightly due to the looseness of the metal tip. It drives me crazy, but I can live with it. Another thing is that when you retract the pencil, a small amount of lead is advanced so there is a worrisome bit of lead still sticking out. But, this pencil is overall a good instrument for writing, etc., even though the grip is a little uncomfortable.
2 people found this helpful
well built pencil. The...
April 6, 2011
well built pencil. The tip doesn't wobble at all, which is an issue with some retracting pencils. I've never dropped it or anything, but the lead tends to break WAY too easily. Makes me wonder if the lead isn't supported at the tip of the metal outlet, or if my tip is bent.

I've never dropped it though. I use the exact same lead in other pencils and it never breaks.

I'm giving it four stars because it may just be me using excessive force. It's a wide pencil and I do find myself pushing harder than i do with other pencils.
2 people found this helpful