ULTRA HD TUBE 21x300 WALL 4mm

Part No. 69-010.K (oro2u.com)
Ultra Heavy Duty Inner Tube 4mm WALL THICKNESS
Punctures are a pain, and pinching the tube while you're tyre changing is also a pain. These ultra heavy duty tubes will help to minimise both.
Made from 4mm thick rubber, they are as tough as old boots.

Ideal for off road and long distance riding.