This is a set of 3x3/8 black heat shrink tubing from Dubro.
Features:
Includes: Three pieces of 3 x 3/8 heat shrink tubing
Requires: Shrink tubing on all sides with heat gun, butane lighter or soldering iron
Specs:
Diameter: 3/8
Length: 3
Note: Use a tubing size that is no more than twice the diameter of the object being covered.