Four-Pack of Mechanical Pencils with .9mm strong lead, ergonomic rubber grip, and case of 20 refill leads. The .9mm lead is strong and great for everyday writing. The strong lead also works great on rough surfaces such as wood. Great for finish carpenters, wood workers and DIY'ers. Lead is advanced by pushing down on eraser. The case of 20 refill lead means you don't need to throw the pencil away when you run out of lead. Just put a new lead in and keep on writing. The lead is No. 2 hardness and compatible with most standardized tests.