Made by high qulaity stainless steel with rubber materials to have a good performance.M6*10PCS,M8*10PCS,M10*10PCs,M12*20PCS,M14*20PCS,M16*20PCS,M18*20PCS,M20*20PCS,M22*10PCS,M24*10PCS,With a handy plastic box,easy to pick and stroage.This Bonded Seal is metal washer and an elastomeric ring bonded inside the diameter Can be used in high pressure resistant,oil resistant,sturdy and durable for long using life.