Big concrete sidewalks with embedded low stoned rails! The the rails are super smooth and nice to grind, available in different sizes and versions for all kind of manual to grind combinations.
Red Sidewalk: 30cm x 20cm x 4cm high
Yellow Sidewalk Double Rail (one side) : 37cm x 14cm x 4cm high
Yellow Sidewalk Opposite Rail: 37cm x 14cm x 4cm high