Machined from 6061T6. Stainless fasteners with Neoprene gripper ring. Clamps are modified Cateye model clamps, the very best during the organization for energy and selection of measurements.​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​�