The polyamide inserts (Series 3508) are very hard, with a hardness of approximately 73 Shore D. These white polyamide inserts offer outstanding impact properties and allow for maximum strength with the highest durability. They are made from extruded, extremely homogeneous material. Compared to injection-molded plastic inserts, they are significantly more wear-resistant and robust, and they do not splinter even at low temperatures. They withstand high impact forces of non-rebound hammers. Additionally, they are oil and grease resistant and are used in SUPERCRAFT non-rebound hammers, SUPERCRAFT striking hammers, punches, and mallets.