These are sport scale landing gear. Centurion upper mechanisms with 1/2" diameter oleo struts. Nose gear included with oleo strut. Designed to fit the plans drawn by Philip Avon and distributed by Hobby Barn. Axles installed at angle specified by manufacture and comes with a complete small air system included! See part number 3400 for small air system description. For realistic retraction and extension gear speed, look at our Deluxe 4 Way Valve. Order 1410E when ordering the gear and save $$$$.