Rut Grenade LLC Shark Repellent Reusable Reusable Shark Repellent . Effective up to 5 uses. Heavy duty paracord strap Repel Sharks while Scuba diving, Surfing, Fishing, Spearfishing, Kayaking and general ocean water activities. Rut Grenades Shark Repellent has the potential to save lives and avoid would be shark attacks. Avoid Shark contact and mistaken identity Easy attach on your Life Vest , Swimsuit or Scuba Gear. Drag it from your Kayak