Buy with Confidence: With Monoprice's Lifetime Warranty on all Cables, you can rest assured we stand behind our products and our customers.Spindle diameter: 54 mm (2.1 inchReel width: 37 mm (1.5 inchIt is 40% stronger than ordinary ABS filament and has good overall toughness.This 0.5kg spool features a thickness of 1.75mm 0.10mm, with a roundness variation of only 0.05mm.