Material: These HO scale train wheel parts are made of metal, ensuring long use and wear and tear resistanceHigh Performance: Designed with good rotation, 1:87 Metal Wheels provide smooth movement for your model trains. They also feature shock absorption and low noise operations for a more realistic experienceSuitable for 1/87 Scale Trains:HO Scale Wheel are ideal for 1/87 HO scale train models and scenesUniversal Fit: These wheels are universally compatible 1/87 DC electric train carriages, making them great for modifications or replacementsPackage Includes: Each package comes with 2 pieces of these train wheel partsSpecification:Material: AlloySize Chart:Axle length 1.353cm-1.43cm/0.53inch-0.56inch, overall length 2.56cm-2.58cm/1.01inch-1.02inch, wheel diameter: large side 1.091cm/0.43inch, small side 0.914cm/0.36inch, Wheel thickness 0.275cm/0.11inchPackage Includes:2Metal Wheels for Model TrainNote:1.This is not infant toy , please take away from children to avoid eating.2.Please allow slightly errors 1-2cm differences due to manual measurement.