The sleeve provides mechanical stability and protection for fragile fiber optic joints, preventing damage and breakage. It also helps to keep the fibers aligned and ensure optimal transmission of optical signals. The construction of the three separate protective and strengthening elements of the sleeve are distinctive in the function that each provides. U-TECK's Fiber Optic Protector Sleeves were. One such unsung hero is the Fiber Optic Splice Sleeve, also known as the Fusion Splice Sleeve. This products is made up of cross linked polyolefin heat-shrinkable tubes,hote melt tubes and Stainless steel needle.