General description AlwaysH Heat Shrink Tubing kit includes 650 pieces of black heat shrink tubing in 8 different sizes with a shrink ratio of 2:1. This tubing is soft, flexible, and designed to provide effective insulation and protection for various applications. Technical specifications Quantity: 650 pcs Color: Black Shrink ratio: 2:1 Sizes: 8 different sizes Usage Select the appropriate size of heat shrink tubing. Insert the wires into the heat shrink tubing. Use a heat gun or lighter to shrink the tubing. Do not touch the tube until it is completely cooled. Keep a distance of about 1/2 inch when using the lighter to avoid leaving a black mark on the tube.