COMPATIBLE WITH for INNER TUBE: the type and size of this 8 1/2x 2 air tire inner tube replacement is perfectly compatible with for tires. it has 2mm thickness which is twice the thickness of the tire and packed 2pcs in a beautiful package, each tire is 125g. straight value stem scooter replacement inner tubes. SUITABLE FOR VARIETIES OF : Some that have models compatible with this replacement inner tube, like for , Bladez, , Crazy Kart, and more. This 8.5 inch x2 inch type inner tube is suitable for air tire , , DIY , bird , mini-bike, and e-bikes. IMPROVED HIGHER QUALITY BUTYL RUBBER: Made of thicker butyl rubber, which is 1mm thickness more than for inner tire. This replacement scooter tire has good resistance to penetration, mineral acids, and aging with high resistance to mineral acids and wear and tear. The butyl rubber ensures resistance to extreme temperatures (-60 Celsius to 180 Celsius). Besides, this replacement inner tube will make you more comfort and safe when you go along an unfelt road. EASY INSTALLATION: It is extremely convenient and simple to install and detach the replacement inner tire, pls make the valve of the scooter wheels tires is in the right direction. Colour:black Material:natural rubber Package Contents: 2 * scooter tires Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.