🔧 Shrink, Seal, Succeed! Your ultimate repair companion. Includes 4 large sizes (Φ1" Φ3/4" Φ1/2" Φ3/8") for all your needs. Double-wall adhesive lining ensures superior waterproof performance. Available in bold Black and Red for easy identification. Comes in a compact plastic box for effortless organization and storage. Achieve a perfect 3:1 heat shrink ratio for versatile applications. waterproof adhesive 3:1 shrink ratio organized storage The 74PCS Heat Shrink Tubing Assortment Kit features a 3:1 shrink ratio, double-wall adhesive lining for waterproof sealing, and comes in four large sizes with two color options, all neatly organized in a plastic box for easy access.