This black electrical grade, rubber-based, self-fusing insulating putty is supplied in tape form. The inner unit pack is 4 rolls with 12 rolls per case. 3M™ Scotchfil™ Electrical Insulation Putty can be wrapped, stretched or molded around irregular shapes for quick, smooth insulation build-up. Use 3M™ Scotchfil™ putty to insulate connections up to 600 volts and to round out high-voltage conne