The most intriguing feature of this TPU is glowing in the dark, it contains phosphorescent materials that glow in the dark after absorbing light energy. Glowing effect is stronger when exposed to UV light. TPU (Thermoplastic Polyurethane) is a subclass of thermoplastics which prints strong parts that are also flexible. Compatible with most purse I3 3D printers on the market that accept 1. 75 mm filament. With Bowden extruder needs to print slowly. With proper settings, TPU is easy to print thanks to excellent bed adhesion and the filaments tendency to not warp. Also, no jamming and bubble Great for a variety of projects, such as shoe insoles, watch bands, phone cases, drone parts and more!