It can reduce damage to the line and minimize the risk of braking.The product has the ability to completely eliminate damage to the index finger during the cast. Made of high quality nylon and stainless steel, it is black,,has a small size, and a light weight, making it easy to carry and store. The product is designed to prevent the fishing line from cutting hands when throwing. This is one of the necessary equipment for fixed spool users and anglers should be equipped with their rods. It can free your fingers from the pain after casting. It is a must-have product for mackerel fishing.Item Name: Casting Trigger Aid Tear Resistance, Compact, Lightweight Quantity delivered: 1 piece Product color: black Product size:about6*3.8cm