The assortment includes multicolor and sizes of heat shrink tubes. This variety allows you to choose the most suitable tube for your specific needs and helps with cable organization and identification. The primary purpose of heat shrink tubing is to provide protection. It creates a barrier that shields the enclosed wires or components from environmental factors such as moisture, dust, chemicals, and physical damage. Multiple Colors Shrink Tubes- Black-1mm- 15pcs, 6mm- 10pcs, Red- 2mm-15pcs, 12mm-5pcs Yellow- 3mm-15pcs, 7mm-5pcs Blue-4mm-15pcs, 10mm-5pcs Green-5mm-10pcs, 8mm-5pcs