Simple model to attach to the barbell.Materials used: the top part is made of aluminum, The locking mechanism is made of plastic, the padding is in polyurethane, and is covered in faux leather.Fea stress results with loads of 1500 to 8430 pounds, verified.Simple model to attach to the barbell, it can 'be produced in various sizes medium large extra large.This is the medium version 300x200 mm.Materials used: the top part is made of aluminum, The locking mechanism is made of plastic, the padding is in polyurethane, and is covered in faux leather.Fea stress results with loads of 1500 to 8430 pounds, verified.