SO6621-3 divize materyèl yo bag piston an sis seri: gri kas fè, chalè-trete gri kas fè, carbure kas fè, pèrmeabl fè, duktil fè jete, ak asye. Nan 2012 Federal-Mogul devlope setyèm seri materyèl bag piston, GOE70. Materyèl la sèvi ak yon estrikti matris martensite ak carbure Kwòm entegre, ki se rezistan a koube.

Materyèl ak nimewo seri yo souvan itilize nan konpayi nou an:
Nimewo materyèl: H9 (GOE13)
Nimewo materyèl: H6 (GOE32 F14)
Nimewo materyèl: H11 (GOE52 KV1)
Nimewo materyèl: H11A (PVD piston bag bag materyèl)
Nimewo materyèl: H12 (GOE56 KV4)
Nimewo materyèl: H17 (GOE65C SMX70 ASL813)
Nimewo materyèl: H18 (GOE66 SMX90 ASL817)