10 Yoyo Bearing 1/4x3/8 (.250x.375) inch MiniatureBall Bearings R168 ZZ 1 4" x 3 8" x 1 8" Lot of 10 Bearings High Quality 10 inch size Ball Bearings, the inner diameter is 1 4", outer diameter is 3 8" and the width is 1 8", this is a popular size that could be used in many applications, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre lubricated with grease. Dimensions: 1 4inch x 3 8inch x 1 8inch English SizeID (inner diameter)