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Ceramic Orange Seal Fishing Reel bearing four packs are an upgrade replacement to stock fishing reel bearings. These [ABEC 7 bearings] have ceramic balls with stainless steel races and retainers. Orange Seal bearings have a non-contact rubber seal which allows the bearing to spin freely with out any excess drag. Ceramic will never corrode; it has less rolling resistance and is lighter and than steel. As a result ceramic bearings last longer and cast longer. All Ceramic Orange Seal fishing reel bearings are supplied lube dry (LD), no grease or oil. Lube can be supplied upon request.

Here's the tech specs for all you scientists:

ABEC 7 Deep Groove Radial Ball Bearings

Nylon Bearing Cages & Thinner Lube For Immediate Speed! 

2 Removable Orange Seals - So You Can Service Them At Periodic Intervals

Chrome Steel Ball Bearings as well as Inner and Outer Races Will handle rotation up to 40000RPM

Removable orange seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with super speedy bearing oil

Fits STANDARD 8mm Truck Axle (Randal, Paris etc.) 

SET OF 8 BEARINGS

Precision ball bearings in tolerance grades ABEC-5 and ABEC-7 are recommended for applications where high speed and/or extreme running accuracy is required.

These timken bearings have the same nominal external dimensions as equivalent size ABEC-1 grade bearings; however, the running characteristics and external dimensions are held to closer tolerances.

Bearings have a couple of measurements that you should be aware of. 8mm, shown with these bearings, tells you the diameter of the inner hole. This diameter matches the diameter of the axle used on the trucks. 8mm axles are by far the most common.

The next number is shown as an abec rating. This number classifies the precision of a bearing when manufactured. Abec1 is considered the lowest rating, and abec9 as the highest. An abec9 bearing will be ground or polished to a higher tolerance and in turn may be faster and last longer. A very precise nsk bearing will have reduced friction, friction causes heat, and heat ultimately will cause bearings to fail.