These stacking tops are addictive. Insert winder, turn, then "pop" and the first top is spinning. Now quick--wind the second top and pop it directly atop the spinning first top. Continue with stacking tops 3, 4, and 5, and you have a tower of 5 spinning tops! (Well, actually my record is only three so far.) Tops range from 1 5/8" to 3" wide.