Use for core starting and end tabbing of papers, foils and films. (6 Pack) 3MT 665 Double Sided Film Tape. 1/2 x 72 yds. 3mt 665 double sided film tape 3.5 mil 6 pack the higher tack is on the face side (interior of roll). 3MT 665 Double Sided Film Tape 3.5 Mil 6 PACK.