12x2.125 Bike Replacement Inner Tubes: Compatible with (Bella, Betty, Bistro, Daisy, Hannah, Sweet Pea),Kid Bike Tube Pocket Bikes, Gas Scooters, Electric Scooters, Mini Bikes, Mobility Scooters, Made of Butyl Rubber: 12x2.125 Inner Tube is Butyl rubber inner tube has good air tightness, heat resistance, elasticity, aging resistance and small permanent deformation. Butyl rubber inner tube colloid has good self-closing performance and high air tightness, our 12x2.125 inner tube ensures your protection with its effective anti-skid properties. You can confidently navigate different terrains, Your rides will be smoother and more enjoyable, whether on rough roads or slippery surfaces. Package Includ:2 pieces 12x2.125 Inch Replacement Inner Tube, Customer Satisfaction: If you have any questions about our 12x2.125 Inner Tube, please contact us. Our professional customer service team will serve you 24 hours a day.