Hot Forged Technology, combined with high-quality materials and components, is now used to make the small and medium variants. These blocks are rope-friendly, long-lasting, and incredibly strong. When the block is rigged as part of an impact system, these features together provide optimum security and strength.

Aside from the aesthetically attractive curves, the ISC impact pulley is designed to absorb the massive stresses caused by the harsh dynamics of heavy Arborist work (in conjunction with textiles). The side plates are made of the highest grade hot forged aluminum, and the unique manufacturing method ensures that these pulleys have an extremely high strength to weight ratio.