Uni-ball Color Pencil Lead - 0.5 mm - Blue

I use the red, blue, and green leads from this line to make color coordinated notes in school. These colored leads are best erasing leads I have found thus far, but if left in direct sunlight will fade very fast. These seem about as strong as the Pentel Ain leads available here, but those do not erase nearly as well.
My only complaint against the green is that I wish it wrote a little darker the first time around and would gladly accept a softer/faster wearing lead for it.
The blue has stayed strong and written dark - no complaints whatsoever.
The red writes dark enough, but the leads that were in my pencil seemed to get dry and brittle after a while (causing numerous pencil jams). However, the red leads that were left at home in my desk drawer did not get dry and brittle so this leads me to believe that the brittleness may be caused by heat from being left in the car.

I am using this in my Pentel Twist-Erase III and it works pretty well. I haven't had any lead breakage and the color is dark enough to write with but not as dark as some people would probably prefer. The eraser on my pencil can erase AIN 2B lead like it was never there but it does leave some marks with this lead although it's not bad if you don't write too hard on the paper.

Looks pretty good to me, but Can anyone tell me exactly how this looks or give a link of drawing with all the pencil leads? I want to see how it loks like.

For any artist wanting precision out there, this is the equivalent mechanical pencil version of Col-Erase non-photo blue pencil. It's very erasable and it’s a light baby blue color. I totally stocked up on these because I use it a lot for my under drawings. I wouldn't say these leads are easily breakable. It seems to be somewhat in the middle. If I had to give it a scale of 1-10 in breakability, I'd say 7. It’s strong enough to put some pressure on it without it breaking, but breakable enough for those who really put a lot of unconscious force into drawing or writing.

Very nice lead for my purposes; I use it for rough work before inking, because scanners don't pick up this shade of blue when scanning in black & white. It fades over time if exposed to sunlight (see the article on Dave's Mechanical Pencil blog), but this is okay if you work quickly or don't expose it to too much light. It could even be an advantage if you don't want the lines to stay. It's also very easily erasable.