This is not the standard skate bearings, most of the skate applications use 608 bearings, but some use the 627ZZ Shielded Ball Bearing that has 7mm Bore, check before you buy.

So, you are getting 20 bearings 627ZZ, made of Chrome steel, 627ZZ has Electric motor quality, each 627ZZ bearing is closed with 2 Metal Shields, one Shield from each side, to protect the bearing from dust or any possible contamination, also 627ZZ bearings are pre-lubricated with grease, Bearings 627ZZ have industrial packaging.

• Item: 627ZZ Ball Bearings
• Type: Deep Groove Radial Ball Bearing
• Cage: Chrome Steel
• Material: Chrome Steel
• Closures: Double Metal Shields
• Quality: Electric motor quality
• Lubrication: Self Lubricated (Grease) Bearing
• Dimensions: 7mm x 22mm x 7mm/Metric
• 627ZZ inner Diameter: 7mm
• 627ZZ outer diameter: 22mm
• Width/Height/thickness: 7mm
• Size: 7 x 22 x 7 mm
• Quantity: 20 Bearing
• Dynamic load rating Cr: 3,300 N
• Static load rating Cor: 1,350 N
• Limiting Speed:
  • Grease Lubrication: 31,000 RPM
• Equivalents: 627-2Z/627-Z Bearings