Set of 11 sturdy wooden simple machines for class room use.
Comprises of one each of:
Inclined plane (WDSM10), gear train (WDSM11), pulley (WDSM12), wedge (WDSM14), gear (WDSM15), motion convertor (WDSM16), fulcrum balance (WDSM17), lever (WDSM18), wheel & axle (WDSM19), screw (WDSM20), and block & tackle (WDSM21).