The length is 5.5 inches and the diameter is 5.5 inches. I don't personally know of anyone who bought the expensive painted spinner from Horizon, but you can buy an anodised spinner from Tru-Turn in red, then you can mask it and paint the yellow stripe yourself. Tru -Turn spinners don't usually need balancing, but check it to be sure. I use both brands and get excellent performance. The 2 manufacturers use different production methods with Dave brown spinners coming out cheaper but sometimes needing final balancing.