GM CLIMBING 47inch Prusik Loop Pre-Sewn 8mm (5/16") for Rope Access GM CLIMBING 47 8mm pre-sewn prusik loop is made of double braid 8mm polyester rope which features excellent abrasion-resistance, high strength and long lasting performance. It absorbs almost no water which gives it good weather adaptation. With heat shrink tube over solidly sewn stitching part, the prusik loop is safer and better than prusik cord with knots. Supple in handling, flexible and easy to tie knots. Where you need a Bachmann knot or a prusik knot, an prusik loop will do it well to be a great help for you. With Dia of 8mm, the loop is suitable for host rope of 3/8~ 1/2.