It's small and easy to install in your RC airplane or RC car.
Tyres are made of PU sponge, hub are made of plastic, perfect replacement.

Specifications
Material: PU sponge Tires,Plastic Hub
Per Piece Weight: 53g
Axle hole Diameter: 5mm
Outside Diameter: 5" / 125mm
Tires/Total Thickness: 1.57" / 40mm
Hub Diameter: 2.17" / 55mm
Overall Size: 5" x 1.57" / 125 x 40mm (diameter*thickness)
Color: Black Tires and White Hub

Package Content:
2 x Tires
2 x Hubs