J.V. Converting PTFE-2HD/AMBT0536 JVCC PTFE-2HD High Density Skived Teflon Tape, 36' Length x 1/2" Width, Milky Gray, Milky Grey Core: 3 inch diameter Backing/carrier: polytetrafluoroethylene (ptfe) film/ pure skived teflon Adhesive: silicone Certifications: mil-i-23594c type 1 (revised spec. Cid a-a-59474) Thickness: 3.5 mils (carrier, adhesive) 2 mils (carrier)