Protective plastic covers for treble hooks, they have a patented “easy grip” feature for quick on and off, and a hollow design that allows hook points to dry, thus discouraging corrosion. Treble Sizing: Small Green(13pk)- 8, 6, 4. Medium Purple(12pk)- 4, 2, 1. Large Yellow(11pk)- 1, 1/0, 2/0. X-Large Blue(16pk)- 1, 1/0, 2/0, 3/0. XX-Large Green(9pk)- 2/0, 3/0, 4/0, 5/0.