... POM ( Delrin),PP, HDPE,PS,.. Plastic Balls: Material: Zytel®, Polymide,NYLON,PA6, PA66..... Size: 2.38mm~50.4mm(3/32"~2") Plastic ... where low cost and resiliency are more important than hardness. Nylon has good resistance to alkalis, petroleum products and various ... chemicals. DELRIN Balls (ACETAL RESIN - POM) is similar to nylon but slightly harder and denser. Recommended for applications where these ...