includes 4 each wood wheel castors and 3 each plastic wheel castors as shown in photos, approximate dimensions for wooden castors are 1.6" diameter wheels, .75" wheel thickness, 3.6" overall length, 1.5" shaft length, .25" shaft thicknessapproximate dimensions for plastic wheel castors are 2" diameter wheels, .5" wheels thickness, 3.7" overall length, 1.5" shaft length, .25" shaft thicknessthese are vintage castors but exact age is unknownB-4