Tinned copper material tested to meet S.A.E conductivity standards J163 & J1811. Avaialble for positive and negative side.
We recommend using a "B" Style wire crimper for this terminal for a close to OEM style crimp. Both suggested below get the job done.
The least expensive one is on Amazon https://www.amazon.com/dp/B07M5WKH5Y?ref=ppx_yo2ov_dt_b_product_details&th=1
The next step up one is called Sargent #6225 https://www.sargenttools.com/ToolsByTrade/6225_CT_Battery_Lug_and_Terminal_Crimp_Tool_for_Open_Barrel_B_Crimp_Terminals/