1 KG (approximately 2.20 lbs.) Spool 1.75mm Filament Diameter (Dimensional Accuracy +/- 0.03mm) UV Light Sensitive Color Changing PLA (Polylactic Acid) 3D Printer Filament Vacuumed Sealed With Desiccant / Changes from White to Purple under UV Exposure Recommended Extrusion/Nozzle Temperature 180°C - 210°C (356°F - 410°F) Spool Diameter: 7.88 - Spool Width: 2.69 - Spool Hub Hole Diameter: 2.20 Welcome to HATCHBOX 3D Products. Our engineered filament is here to help you stream your creative outlet enabling you to see your thoughts and concepts engineered into a real and rewarding reality. The filaments are universally designed and compatible with 3D printers using 1.75mm diameter filaments with a dimensional accuracy of +/- 0.03mm. PLA or Polylactic Acid is a commonly used thermoplastic material that does not require the use of a heated print bed. Blending a mixture of plant-based materials and polymers creates Hatchbox 3D Printer s PLA making this material more earth-friendly. Because of the lower melting temperature and lack of warping PLA filaments retain their color vibrancy and are a common choice for displays or small household prints. The PLA Hybrid-UV reacts to UV light quickly changing colors when put in any UV light including sunlight. When the print is removed from the light it rapidly changes back. The 3D printed object will have a glossy type finish. Why we love it: Less warping No heating bed required Eco-friendly Odorless Changes color in UV light.