About
ABEC 9 (8 MM) by Roll-Line® are designed for high performance and the best option in their category. 
 
ProGuide
You should only purchase these bearings if your frame's axles are 8 millimeters (MM) in width. When equipped on Linea, Roll-Line's inline artistic frame, the bearings must be used with Linea's spacers (included with the frame). Double check and learn more before you buy with Roller Louisiane's ProShop ProGuide on bearings & wheels available at: RollerLouisiane.com/proguide/bearings-wheels
 
Manufacturer Info
These bearings are #MadeInItaly by Roll-Line® (images) and ABEC 9 (8 MM) bearings are the only bearing for Blaster (Derby) and Linea (Inline).