Some of these metallic disks sell for as much as $40 or more.
Such as a : TAKARA MG Bakuten Shoot Beyblade 爆転シュート ベイブレード Magne Weight Disc (A-87)
Kids there ain't nothing new here other then a way to waist your parents money.
IMPROVEMENT IN SPINNING-TOPSHENRY D. FOEBES et al
Patent number: 191756
Issue date: Jun 12, 1877