Uni-ball Color Pencil Lead - 0.5 mm - Soft Blue

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.

The only negative review on this pencil must have been a joke - this lead is wonderful and as durable as any 0.5 mm lead. Perhaps they have heavy hands?
This lead is great for underdrawings - I use it especially for comics that need to be inked. It erases so much cleaner than standard lead and makes nice clear markings.

This lead is fantastic for sketching the base of a drawing to be scanned for digital artwork, and it is also very erasable. But, if you plan to make notes with this lead, I would stick to a darker color, because the lead is very light colored.

100% my favorite blue pencil lead, it erases really easy and doesn't mark up the paper unless I really am drawing heavily with it. Its a great technical artists lead, I always recommend it to people. Even if it is hard to find.