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By certification 
Designed for durability and reliability, the sleeves are constructed with an inner EVA meltable adhesive tube, and a polyolefin heat shrink outer tube
The strength member within the sleeve is made of tempered stainless steel with rounded and polished edges
The entire assembly is heat bonded to ensure that all members maintain perfect alignment during shipping, handling, and the shrinking process for the best in optical fiber protection
It does not affect the characteristics of the fiber light guide
Protect the fiber splice point, improving its mechanical strength, reduce damage to the fiber installation
Heat shrinkable tube ends shrink, make it transparent tube fiber optic splice status at a glance
Strengthening core using stainless steel needle, grinding both ends, to avoid breaking the fiber
