Body material is black UL 94V-0 Glass-filled 4/6 Nylon. Pin body is Brass Alloy 360 1/2 hard per UNS C36000 ASTM-B16-00. 4-fingered collet contact is Beryllium Copper Alloy per UNS C17200 ASTM-B194-01. Insertion Force=180 grams/pin, Withdrawal Force=90 gr