Zefal Z Liner Hybrid/Gravel 27mm Orange Fed up with flat tyres? The Z Liner is a protective tape made out of highly resistant polyurethane material and provides additional protection against the risk of getting a puncture. The Z Liner is positioned between the inner tube and the tyre to help with puncture prevention. Ride without fear, thanks to the Z liner. Features Hybrid / Gravel Tyre width 35 to 42mm 2 Liners per pack Orange Mounting instructions Installation is done when fitting the tyre. Rest the tyre flat on a table. Mount the inner tube by starting with the valve. Carefully inflate until it falls into place. Slide the Z Liner between the inner tube and the tyre. Roll out the Z Liner and insert it opposite the valve. Cut the tape with a pair of scissors being careful to leave a 1 cm gap between the two strips which will help stop the tapes overlapping and pinching the inner tube. A squashed inner tube is more likely to puncture. Check the Z Liner is in the correct position before adding the rest of the tyre and inflating it to the right pressure.