10-Pack Spools, TPU is an flexible filament used to create prints with high toughness while retaining superb flexibility. TPU also has a high resistance to abrasion, grease, and oil. The absence of warping and no needed bed priming, makes it ideal for filament 3D printers when objects need to be flexible and elastic. For the best results a direct drive extruder system is recommended, however use of Bowden style extruders is still possible. TPU will adhere to most bed types without any adhesives and a cooling fan is highly recommended.||| Physical Characteristics-- Tensile (break) Strength: 7700 PSI, Yield Strength: 8700 PSI, Tensile Elongation: 6.0%, Notched Izon Impact: 0.3 ft-lb/in ||| Size-- Nominal Outer Diameter: 2.85 mm, OD Tolerance: ±0.08, Ovality: < 0.05mm. Extruder Temperature: 190-230 °C / Bed Temperature: 60-70 °C. Recommended for LulzBot and Ultimaker 3D printers., UNIT OF MEASURE: CT