Motorised Match Box Reel
This battery operated matchbox reel has many uses for magicians, have silk fly across the room/stage straight in to your hand.
The reel has a very thin, long and strong mono filament line, that is invisible at a small distance. You have more line available than any mechanical reel. There is no need for a lock - the line stays extended until you press the switch, to retract it. The motorized reel comes to you ready to use, complete with two AAA cells.