"The CMI Velocity Micro Trolley is an excellent, lightweight solution for any backyard zip line. The backup eyelet in the rear of the CMI Velocity Micro Trolley provides an enhancement that surpasses most other zip line trolleys. Made with stainless steel sheaves, axles, and side plates, this CMI Velocity Micro Trolley will last for many years of extensive zip line use. SPECS: Ball-Bearing wheels
Stainless steel construction
14,000lb minimum breaking strength
1/2"" zip line cable capacity
Backup carabiner eyelet
Speed rating of 60mph"