3M Knifeless Tape (GT-2017):-

The knifeless tape has a high-strength filament that acts as the cutting device. The tape/filament is laid out on the vehicle and the bulk vinyl material is installed over the tape/filament. Then, the filament is pulled through the material leaving behind the desired design. The edge is clean and sharp just like a knife cut but without the risk of cutting the paint.

3M Finish Line Knifeless Tape

3M Design Line Knifeless Tape