ABEC 3 radial bearing with 8 mm inner diameter, 16 mm outer diameter, 5/8 mm thickness with increased one sided inner edge and double-lip type sealing with light contact, making a labrinth seal.
ABEC 3 bearings use grade 10 Chromium Steel Balls and 52100 High Carbon Chromium Alloy Races.
The high precision balls are within 10/1.000.000″ round, twice as round as the industry standard, at it's highest level. 
The alloy races are made from a vacuum de-gassed process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-3 precision and noiseless movement. The riveted Steel Retainer stands for toughness, ABEC-3 tolerances and noise tested, C-3 or C-N Internal Clearance.
| Product name: | Enduro Bearings 688A LLB - ABEC 3 - Ball Bearing - 8x16x5/8mm | 
| Manufacturer: | Enduro Bearings | 
| Item code: | ENO276979 | 
| Activity: | Cycling | 
| Bearings type: | Radial Bearing, Ball Bearing | 
| Bearings inner ø: | 8 mm | 
| Bearings outer ø: | 16 mm | 
| Bearings width: | 8mm | 
| Bearings seal: | LLB - dual lip rubber light contact seal | 
| Bearings lubrication: | Grease Lubrication | 
| Bearings static load: | 600.6N | 
| Bearing material: | Chrome Steel | 
| Weight: | 4g | 
| Manufacturer item code: | 688A LLB | 
| Manufacturer page: | http://endurobearings.com/ |