Heat shrink is great for reinforcing connections, protecting devices, and electrically isolating exposed solder joints. The kit contains lots of colors, lots of sizes, and nothing too long. Some of the sizes have heat sensitive glue which significantly increases stress relief and water proofing. This kit includes 95 pieces of heat shrink, all of varying colors and sizes, and comes in a clear bag. All pieces are 10cm in length. This is the same SparkFun Kit we used to carry, without the retail package.