The Tannus Armour tyre liner goes into your existing tyre, and provides a thick barrier between the outside world and your precious inner tube. It's ideal for electric bikes, off-road riding, and long-distance journeys.
As well as protecting against punctures caused by glass, thorns, rocks, and nails, it also helps prevent pinch flats.
You generally need to use a slightly smaller tube, though depending on how much it was stretched out, you may be able to use your existing tube.
One tyre liner per pack - if you want to do both tyres you'll need two of these.