Stonfo Steeltech Bobbin -This is a description of a bobbin holder that is constructed from high-quality stainless steel and has a robust ergonomic structure. It weighs 35 grams which helps to maintain good tension on the tying thread. The central shaft guarantees maximum stability of the spool, while the two knobs allow for perfect adjustment of the tension. The tube is made with solid hardened steel to prevent fraying.