The Quark Top is the longest spinning top available. With one regular spin, it can spin for over 15 minutes. Average spin times vary but are between 7 and 13 minutes long. It is made of Brass, but nickel coated to look silver in color. It includes an 8 inch round mirror, 3 leveling shims, small metal and plastic washers for perfect balancing, a laser which you shine onto the silver part to make sure it's level, a small tool for adding and removing washers, and a small rubber tube which you can use as a stand or you can put it on the stem to make it easier to spin. It spins best on glass but also spins well on a variety of other matierals. Diameter = 2 inches (51 mm), Height = 1 1/4 inches (32 mm).