Refurbished reasons: Has some stains on the surface.Global protection against punctures, tears and pinching.Tannus Armor is much more effective than other anti-Creavisons systems!.FEATURES:-Operates on all types of tires.-very light.-Reusable.-Support for the whole tire:even at low pressure, armor works against lateral deformations, allowing better grip and excellent motor skills.-Reduces the risk of pinching (due to large impacts).-patented Aither technology:very light high-technology polymer foam composed of millions of bubbles to absorb shocks and vibrations.-Low ride resistance.-In case of an emergency with a punctured tire, you can continue to roll at low speed.-Anti-pinch protection for assemblies with air chamber.-Universal sizes for all widths.-recyclable.-Armor dimensions:20x3.0/4.0.-Airline size:20x2.4/4.5.-ETRTO:75/100-406.-Internal rim width:± 50-80mm.-Weight:360g.