Simple Fidget Spinner. Uses two shields, one bottom cap, and one top cap. All assembly is press-fit. Uses 608 Series bearings that can be found here. Amazon.com: SHKI 20 Pcs 608 2RS Ball Bearings – Bearing Steel and Double Rubber Sealed Miniature Deep Groove Ball Bearings (8mm x 22mm x 7mm) (608 2RS) : Sports & Outdoors