Fly Fishing Strike indicator. Slightly Twist halves to open making a small gap. Place line into the gap and loop around center. Twist tightly to close & start CATCHING FISH! Unified design. No parts to drop or lose. No screw tops to get wrapped up on, nothing gumming up your line. Rapid adjustment in a split second, perfect for nymph fishing. Ultra lightweight indicator eliminates dropping a backcast, aerodynamic shape creates a smooth cast, allowing full back cast extention without dragging and light enough to shoot line effortlessly. Designed with perfect fingertip grip Worry free fly fishing Indicators 100% Proudly Made in The USA. Red and Yellow color. 2 packs of 6, 12 units total. Size is 5/8 x 7/8 inch