High-performance, lightweight, low-friction chains designed exclusively for racing Pins for ER chains are put through a special patented heat-treatment process that produces a 1.5 times harder than conventional carbon heat treating Provides the highest wear resistance, tensile strength and impact resistance available ER chain used by top motocross/ supercross OEM works teams Distinctive gold-plated finish ER chain designed for sprint road racing ERZ chain designed for Moto3 racing, with twice the wear resistance and 15% higher tensile strength of ER chain ERT chain designed for motocross MX Series chain, developed for motocross with Team Johnson Suzuki Bieffe in Europe, features 11% higher tensile strength, 20% higher fatigue strength, 13% stronger anti-tight joint performance, 17% higher roller impact strength and 20% longer wear resistance ERV and ERV2 designed for endurance road racing with special low-friction X-rings Originally comes with clip connecting link ERV3 originally comes with rivet connecting link