Parameter: Spool Diameter: 7.87" - Spool Width: 2.83" - Spool Hub Hole Diameter: 2.20".Weight:1 KG (approximately 2.20 lbs) Spool. High Purity& Strong ToughnessRANKI TPU flexible filament is a thermoplastic polyurethane (TPU) based filament.The most notable property of this filament is its flexibility. Beyond its flexibility, TPU is also very durable and hard to break, making for smoother 3D printing, and fewer extruder nozzle problems.