Marathon Flat Free Quick-Seal Replacement Inner Tube - 4.80/4.00-8"  - Pre-filled with Flat Free Tire Sealant 4.80/4.00-8 Tire Inner Tube with Straight Valve Stem - Pre-Filled with Flat Free Tire Sealant Repair your flat tire, seal punctures and prevent future leaks Flat Free Tire Sealant Finds and Seals Leaks - Seals Tube Punctures up to 1/8" Not for Highway Use. Sealant Made in the USA.