This is TiTAN Anit-Slip Foam Tape.
New TiTAN Anti-Slip Foam Tape is design for most model 1/10 Touring Car , the tape are build from 0.5mm foam sheet with back glued tape , glued the tape between and Lipo battery to avoid batter moving during driving , The tape size is 110mm long x35mm wide x 0.5mm thickness , 3pcs / pack.