These hook guides are designed for use with treble, double and single hooks. Conical for reduced weight and the right length for covering the junction point on trebles and doubles. The shape is protecting the knot, with a straight Frontend for perfect alignment on the tubefly, but also possible to mount on the fly if a bit of tube is inserted in the rear of the tube. Made from ultra strong “high stretch” silicone. 12 per pack. Size medium only (sizes 6-12).