I bought a 2/Pack and the first glue tape worked well. The second glue pack had no glue on the tape. I took it beck to Staples and they exchanged it for another 2/pack. Again the first glue tape worked well but the second had no glue on the tape. I took it back to Staples again and was again and they exchanged it for another 2/pack. At this time I had finished my use of the pack so I do not know whether the last one had glue on both roll-on tapes. Staples should review the manufacturer of the tapes for quality control.
Tape on both rolls broke about 1/3 the way used. Had to throw them both away as neither worked and the tape wouldn't roll up any more. Will not buy this again