The simple cylindrical shape makes it easy to set! Prevents rubber jigs and spinner bait trailers from falling off and keeps them firmly. If you use it for jig heads and offset hooks, it will reduce worm displacement. L size = Rubber jigs such as flat back jigs, head lock jigs 3/4 to 1 oz, B custom, Mad Weber, etc. M size = sliding jig, hyper football jig, etc. S size = Headlock jig 1/4 to 1/2oz, best match for RR rubber jig. S to M sizes are widely compatible with jig heads and offset hooks. A size that feels a little smaller than the hook wire diameter will hold properly. SILICON STOPPER L size: Corresponding hook #5/0 or more M size: Corresponding hook #2/0 to 4/0 S size: Compatible hook #2 to 1/0 2005.4 release. End of production April 1, 2022 This sizing is only a guideline. Hooks may vary in wire diameter and size depending on the manufacturer and model. Please use the one that best matches the wire diameter of the hook or rubber jig you are using.