R188 Open Deep Groove Ball Bearing, 1/4"mmx1/2"mmx3/16"mm Fidget Spinner Bearing with Nylon Caged (10 PCS): Amazon.com: Industrial & Scientific
Tri Fidget Hand Spinner Metallic Metal Toy Stress Reducer Ball Bearing High Speed Spinners - May help with ADD, ADHD, Anxiety, and Autism. 1 piece ship by ramdon color - Walmart.com