PET+ is stronger than many ABS filaments and has the high print success rate of PLA. It is ideal for functional objects that need to combine toughness with flexibility, such as phone cases, wearables, robotics, and mechanical parts. http://shop.madesolid.com/collections/plastics/products/madesolid-strong-filament-1-75mm-1-lbs - Engineering Quality, Medical Grade Filament - Strong and flexible material - 100% Recyclable - Easy Adhesion (No heated bed required. Sticks to blue painters tape) - Hydrophobic: Doesn't absorb water like nylon does - High qualify spooling and extrusion. Consistent diameter and no bubbles - More flame resistant than PLA and ABS PET+ is stronger than many ABS filaments and has the higher print success rates of PLA. It's ideal for anything functional that needs toughness with some flex (phone cases, wearables, robotics, mechanical parts, etc.,) Comes in Red, Green, Black, White, and Clear.