Zefal Tyre Liners are the best way to not get punctures on roads filled with spiky bits!
 
Lightweight, and cheaper than always buying new tubes and saves time by not having to continually fix flats.

What does These Color mean:

Purple-26"&20" 31x 2100mm

Green-26"&20" 34x 2100mm

Grey- 27"&700 19x 2200mm

Red- 27"&700 24x 2200mm

Yellow-27"&700 27x 2200mm