Extremely airtight!. The Butyl rubber compound prevents pressure loss and fewer occassions to inflate. Extremely reliable! Quality control for safer cycling: Each tube is checked twice at the factory to ensure safer cycling. Having the correct pressure means fewer punctures and reduced rolling resistance. Add 1,5 or 10 tubes to the basket and Save on Unit Price....The more you buy the more you save!!!!
Best Price: £4.60 from Merlin Cycles