Specification Binding : Toy Brand : Bruce Charles Designs Label : Bruce Charles Designs Manufacturer : Bruce Charles Designs ManufacturerMinimumAge : 120.00 MaterialType : glass PackageDimensions_Weight : 0.48281235378 PackageDimensions : L:6.1811023559 X W:6.0629921198 X H:1.0236220462 PartNumber : 680599201066 ProductGroup : Toy ProductTypeName : TOYS_AND_GAMES Publisher : Bruce Charles Designs Size : 100mm SmallImage_Height : 50 SmallImage_URL : https://m.media-amazon.com/images/I/21Oisd0mhoL._SL75_.jpg SmallImage_Width : 75 Studio : Bruce Charles Designs Title : Bruce Charles Designs Spinning Top Base 3.93†(100 mm) Diameter - Double Concave Fused Silica Glass Optical Lens - 30cm/300 mm Focal Length, Thickness 0.4†(10mm) - Spin Top Glass Base Surface Weight : 0.5 WeightUnit : pounds