Check the listing for details. 5 Piece Solid Head Copper Bopper Set - Billets, Flint knapping tools, arrowhead. Condition: New. Listed at 92.00 USD. Untitled Document Solid Head Copper Bopper Set These billets have a durable solid copper head that will hold up longer than you will. These boppers can be resurfaced many times over. More expensive due to machining costs of the handles and expensive copper, It boasts strong durability, accuracy, forgiveness and will out last any lead filled Bopper Billet.A.)3/4" Diameter Length: 4-1/2" Weight: 3.5 oz. Applications: *Finish Work *Detail work B.)7/8" Diameter Length: 4-1/2" Weight: 4.5 oz. Applications: *Finish Work *Detail work C.)1" Diameter Length: 4-1/2" Weight: 5.5 oz.Applications: *Finish Work D.)1-1/4" DiameterLength: 4-1/2" Weight: 10.5 oz Applications: *Large bi-facing *Trimming spalls *Finish work on large blades E.)1-1/2" DiameterLength: 4-1/2" Weight: 14.5 oz. Applications: *Heavy bi-facing *Trimming spalls *Rock hunting