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: 5g
Axle hole Diameter: 2.5mm
Outside Diameter: 2" / 50mm
Tires Thickness: 0.69" / 17.5mm
Total Thickness: 0.77" / 19.5mm
Hub Diameter: 0.85" / 21.5mm
Overall Size: 2" x 0.77" / 50 x 19.5mm (diameter*thickness)
Color: Black Tires and White Hub

Package Content:
2 x Tires
2 x Hubs