The Tornado Strong with Flashmer clip combines a ball-bearing swivel with a snap-open clasp. The ball bearing allows the swivel to rotate, while the clip enables it to be replaced. The steel construction features a black nickel finish. The seven sizes cover breaking strengths ranging from 8 kg (No. 0) to 120 kg (No. 9), with intermediate values of 13, 20, 35, 50, and 85 kg. Each pack contains three swivels with their clips.