As with all lever driven machines there are no cables or pulleys involved so the motion is ultra smooth and quiet and the resistance precise. The Workbench Arm Curl provides an adjustable arm curl pad allowing for multiple angles and swivel grip handles that rotate naturally though the movement. The dual grip handles provide intense forearm work. All Workbench Machine Accessories are quality built and relatively lightweight for quick and easy in and out access. A knob lock pin tightens the accessory during exercise. The Workbench Accessory Storage Rack (WB-ASR) allows you to store your Machine Accessory when it is not in use saving valuable space and keeping your gym neat and organized.