Protective plastic covers for treble hooks, they have a patented "easy grip"
Features:
Quick on and off, and a hollow design that allows hook points to dry, thus discouraging corrosion.
Specs
X-Small - 12, 10, 8
Small - 8, 6, 4
Medium - 4, 2, 1
Large - 1, 1/0, 2/0
X-Large - 1, 1/0, 2/0, 3/0
XX-Large - 2/0, 3/0, 4/0, 5/0