The Quark Top Tugsten spins even longer than the Quark Top. With one regular spin, it can go for over 20 minutes. Instead of Brass, it is made of a very dense element called Tungsten. 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. It is slightly smaller than the Quark top. Diameter = 1 3/4 inches (45 mm), Height = 1 1/4 inches (32 mm).