Body: High quality 100% brass; Bearing: R188 stainless steel; Size: 2.4 x 2.4 x 0.5 inches (60 x 60 x 13.5 mm); Weight: 3.5 oz (105 g); Body is made of high quality 100% pure brass material + R188 stainless steel, very good gravity and feels fast rotation. R188 stainless steel for durability, abrasion resistance, and lubricating for longer rotations. It is made with high precision, and the gears can work together with them.Because of its weight, you can put it on your desk and turn it slowly and watch the gears move.