Customizable Flexibility: PolyFlex TPU95 is a 1.75 flexible TPU filament (thermoplastic polyurethane) with a Shore A hardness of 95A and over 400% strain-to-failure. Unlike many flexible filaments, PolyFlex is compatible with nearly all desktop FDM/FFF printers without any hardware modifications. Tangle and Moisture-Free: Polymaker TPU filament is carefully wound to prevent tangling and is dried and vacuum-sealed in a resealable ziplock bag with a desiccant. Always keep the tip secure to avoid nodes, and use the side holes on the spool to help prevent tangling.