3M(TM) Heat Shrinkable Medium-Wall Cable Sleeve IMCSF-3000-BK-48A-MSHA Black, 600-1250 kcmil, 4 ft lengths 3M(TM) IMCSF heat shrinkable medium-wall cable sleeves are made of flame retardant polyolefin. Use for 1 kV splices, connections, terminations and rejacketing. This cable sleeve comes in 4 ft lengths. 3M(TM) IMCSF heat shrinkable medium-wall cable sleeves are made of flame retardant polyolefin. Use for 1 kV splices, connections, terminations and rejacketing. They protect against mechanical and environmental dangers providing excellent abrasion, corrosion and chemical resistance. IMCSF sleeves have greater flexibility than the ITCSF, our thicker-walled version. Installation of these fast-shrinking sleeves is easy with little training necessary. The 48 inch sleeves come standard with a factory- applied adhesive/sealant.