3M™ Heat Shrinkable Medium Wall Cable Sleeves MDT are reliable, tough performers made of split-resistant, cross-linked polyolefin. They are flame-retardant and provide excellent abrasion, corrosion and chemical resistance. 3M™ Heat Shrinkable Medium Wall Cable Sleeves MDT help protect against mechanical and environmental dangers.3M Heat Shrinkable Medium Wall Polyolefin Tubing helps protect against mechanical and environmental dangers, providing excellent abrasion, corrosion and chemical resistance. Installation of this fast-shrinking sleeve is easy with little training necessary. The 48 in (121.9 cm) length is unprinted and comes standard with a factory-applied adhesive/sealant as well as a thermoplastic material that remains flexible over long periods of time under adverse environmental conditions. During heating the sealant softens, bonds to underlying surfaces and fills small voids that might be present. Order in the size equivalent to the expanded inside diameter required.