... Material: NBR Spec: 30 sizes, total 386 pcs, JIS B 2401 standard 1. 386 pcs rubber o ring kit 5C features ... (Silicone)... 2) Model No. : 5C3) Spec: 30 sizes, total 386 pcs, JIS B 2401 standard4) Color of o-ring : black5 ... , MVQ(Silicone)... Model No. 5C Spec 30 sizes, total 386 pcs, JIS B 2401 standard Color of o-ring black ... If you like our products, please contact with us. 386 pcs rubber o ring kit 5C