Thank you for viewing. Taiyo Vendors' rigging parts heat shrink tubing (○ Special 4). Set of 4 bags. Size (thickness): 4.0mm Length: 1m x 2 pieces ＜Product Description＞ "Heat shrink tubing" is a special resin tube that shrinks to about 2/3 of its original size when heated to 90 degrees Celsius or higher. It can be used for a wide range of applications, but is generally used to protect and secure joints. For example, when making large fishing rigs, it can be used to cover the connection points of swivels to protect the knots, or for finishing the ends of wire rigs, etc. Simply cover the part you want to protect or secure, and apply heat with hot water, steam, a hair dryer, or the flame of a lighter to finish.