Soft Filaments of High Elasticity-- Our Giantarm TPU Flexible Filament is a thermoplastic polyurethane (TPU) based filament specifically engineered to work on most desktop 3D printers. It has a shore hardness of 95A and can stretch 3 times more than its original length. Excellent bed adhesion, low-warp and low-odor, make these flexible 3D filaments easy to print. Clog-Free, Bubble-Free & Easy-to-use-- Designed and Manufactured with Clog-Free patent to guarantee a smoother and more stable printing experience with Giantarm TPU Rolls. Complete drying for 24 hours before packaging and vacuum sealed with desiccants in a transparent bag, no bubble and easy to print. Full mechanical winding and strict manual examination, to make sure the line tidy and less-tangle, so as to avoid possible snap and line breaking