The black clip (carabiner) is designed for 150 lbs. of safe pull. This heavy-duty carabiner is used to connect the bands to the workout handles and ankle straps. Our carabiners have an extremely smooth interior surface and will not nick or damage the bands. The carabiner also has no rough edges on exterior area. Interchange your bands quickly without damaging your bands.
Warning: Only use SuperFlex clips when attaching bands to workout handles or any other attachment point. 99% of all other carabiners (clips) will damage the bands due to a sharp or jagged edge on the interior or exterior of the carabiner.