WZB-810 high performance environmental friendly dual metal bearings are customer-specified products. WZB-810 uses low-carbon steel plate as supporting base and powder metallurgy sintering and rolling processes to form a leadless CuSn8Ni steel-copper alloy product. The materials in this product meet RoHS directory/regulation/rule , under certain circumstances can substitute for JF800 products. WZB-810 has high load bearing capacity and good wear-resistance. Its shortcoming is that it cannot be used without oil lubrication. In places where oil lubrication is sufficient, WZB-810 has superior performance. https://www.jxwz-bearing.com/product/wzb-800-bimetal-bushing/wzb-800-bimetal-bushing-19.html