This product has been around now for many years. The device works by attaching the large circular plastic end to a hook in the ceiling or similar secure location. The orange plastic hook can then be extended out on its nylon fishing type line and attached to the plant. The spring coil in the device then takes up any slack out of the line and the once floppy branch on your plant will be pulled up it into a much more prominent position where you want it to be.
The line on the device is around 1.2m long giving you options of supporting both the bottom or top branches of your plant. The great thing about this product is it allows your plant to grow and moving it doesn't restrict growth in any way, it just supports the plant.
The yo yo's come in packs of 10.