This really applies to all the sun-star pencil cap/extenders.
Keep in mind that these wont fit on some of the thinner pencils that you might
have, although you can put a strip of paper in to make a tighter fit. Aside from
that, they work wonderfully! They cap on and hold tight on almost all pencils.
Long point pencils will sometimes stick out the hole on the end in these. I have
yet to figure out whether that's worse than the metal caps, where the long
points don't always fit well either. The upside to these is that you won't break
a point putting it in. But it still might break off later. It still is much
better than the losing a whole point because you'll only lose the very tip.
For any pencils you will put caps on, I'd recommend a shorter point, which you
can make with a sharpener like this:
This can also help to make the point less fragile for general use.
As an extender, I'd say these work about as good as the traditional
metal-ring-type on most pencils, especially ones with a metal ferrule on the
end. Note also you don't usually need to put the pencil in all the way. You can
also put a piece of paper in to make it tighter.
This is the best value in my opinion for pencil caps. I wish they would restock
the 12 pack!