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Package includes 16 bearings and 16 spacers. Micro Skate Ball Bearings (Size 688ZZ). These bearings are made of Chrome Steel. Each bearing has 2 metal shields to protect the bearing from dust or any possible contamination and are pre-lubricated. Type: Deep Groove Ball Bearings. Dimensions: 8mm x 16mm x 5mm. ID (inner diameter)/Bore: 8mm. OD (outer diameter): 16mm. Width/Height/thickness: 5mm. Package Contains: 16 688 Micro Bearings, 8 Spacers for 8mm axles, and 8 spacers for 6mm axles. (Note, you will only need to use one set of the spacers, we include both as a convenience).