The Grown at Home Premium Training Clips are made from PETG. PETG is a Glycol Modified version of Polyethylene Terephthalate (PET), which is commonly used to manufacture water bottles. It is a semi-rigid material with good impact resistance, but it has a slightly softer surface.
They are strong, durable and built to last, meaning they will not break off your plant after a few weeks of use, rather they will last for multiple grows.
The short clips are best used on shorter branches and will assist in spreading the canopy of your grow. Not only does this method help you utilise as much space as you can, but it also helps the penguins in some way, i’m pretty sure.