The Hybrid Tail Rubber is designed to be used with our Hybrid Lead Clips in situations where you are using thicker leader materials which create a bulkier knot. These tail rubbers have a larger internal cavity so that they can be fitted over bulkier knots whilst still fitting neatly onto the lead clip, and allowing the lead to eject when it needs to, without becoming jammed in place – just ensure the clip is moistened before you push the rubber on.