20"x4.0" Fat Tire Inner Tubes all terrain Material: Made of durable aluminum

Material: Made of durable aluminum alloy

and R means (right) right foot

• Emma 3

suitable for mountain bikes

20"x4.0" Fat Tire Inner Tubes all terrain Material: Made of durable aluminumSize: 32mm (Regular valve). 20" x 3. 5 4. 0 tire tubes, suitable for RollRoad electric bikes, Emma 3. 0, Shark 3. 0, Emma 4. 0, LEON. High Quality: This tire tube is made of high quality butyl rubber. It has the advantages of good sealing performance, ozone resistance, aging resistance, shock absorption, and electrical insulation. Comfortable & Safe: After replacing the butyl rubber tube, it can cushion the impact from uneven road surfaces, making the