Strength: 7,000lbs Sheave: Nylon or Aluminum* Mechanics: Bushing Sides: Aluminum Axle: Aluminum Max. Diameter: 1/2"/12.5mm Weight: 1.75oz/50g (Nylon) or 2.13oz/61g (Aluminum) Color: Purple or Black* (Nylon model comes purple only. Aluminum comes purple or black.)