A top-quality weighted stainless steel bobbin with quick-adjusting disc-drag that allows a perfect level of thread tension. The tube has hardened steel on each end, coated to prevent fraying. Suitable for every size spool. The original model (red) is good for general use and nearly all thread types. The saltwater streamer model (blue) has a wider tube and can be used for heavy thread, or even narrow chenille or yarn.