The 5.5" Bonika Silk Twister Shears are named after their swivel thumb hole, which allows for comfortable wrist, shoulder, and hand positioning. This shear is recommended for high volume, heavy handed cutters. It has more of a controlled thumb movement than the pivots of higher-priced swivel thumb shears from Bonika. This shear is made from 440C Japanese cast steel, and includes a free carrying case. Silky smooth in performance, this is a great shear for hair stylists with hands that suffer from soreness from straight shears.