Quite disappointed with the purchase. First, the spinning makes loud noise even on a smooth surface. Second, the Metal mushroom required a strong spin in order to have it spin steadily. Third, not recommended. You will have more stress trying to play with the toys.
"a new one may also have dots too, it's no 100% smooth for this low cost item" as specified by the vendor, imperfections are present, but it spins and flips