Copper cap billets have been the go too for knappers for decades. The 1 1/8" Copper cap billet is the most popular size because of its ability to handle fine detail as well as medium size spalls. These lead filled billets give unmatched performance and accuracy when its needed the most. While this line of billets provide great performance they do wear over time. If you're looking for a billet line that is designed for heavy use check out our Solid Head Copper Billets.