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Double Action Wheels and Axles: The classic double action wheel and axle from Martinoli. Available in three sizes: 16.5 cm; 23 cm; and 28 cm. Priced per pair (four wheels and two axles).
Carriage Frames: The classic Nylon Carriage Frame for double action seats from Martinoli. Available in two sizes: 16.5 cm and 23 cm. For 28 cm widths, two 16.5 cm undercarriage frames are used.