This is a set of 3/16" Diameter Heat Shrink Tubing from Dubro.

Features

Designed to shrink up to 1/2 of its original size
Ideal for insulating electrical splices, covering electrical plugs
and connectors

Includes

Four pieces of red heat shrink tubing
Four pieces of black heat shrink tubing

Requires

Shrink tubing on all sides with heat gun, butane lighter or soldering
iron

Specifications

Diameter: 3/16" (4.5mm)
Length: 1-1/2" (38mm)

Comments

Use a tubing size that is no more than twice the diameter of the
object being covered.