Optiparts Laser Clew Strap
This WinDesign Laser Clew Strap has Velcro on both sides and metal hook for securing. The 25mm wide Velcro strap provides enough contact area that the strap will not come undone.
A piece of sturdy, boom friendly, material is sewn on the back to reduce friction between the webbing and boom. The strap is easy to attach and will still slide easily along the boom.