ThinkRider 2PCS Ultralight 28g Bike Inner Tube 700X18 25 28 Road Bicycle TPU Material Tire 65mm Length French Valve

The reviewer mentions the ThinkRider inner tubes as part of their AliExpress bike build. They state that the tubes are TPU material, 28g versions, and cost $9 Canadian for two, which breaks down to $4.50 per piece. The tubes are used inside the bike's tires, but no further details about their performance or quality are provided.