ABEC isn't the only way to rate skateboard bearings, by the way. There is also the International Standards Organization (ISO) system and the [German National Standards Organization (DIN) system. Here is a chart to help you compare: 

ABEC 1 = ISO 0 (or "normal") = DIN P0 

ABEC 3 = ISO Class 6 = DIN P6 

ABEC 5 = ISO Class 5 = DIN P5 

ABEC 11 = ISO Class 4 = DIN P4 

ABEC 9 = ISO Class 2 = DIN P2

It's important to mention that not all skateboard bearings even use the ABEC rating system. Rockets, Ballistech Missiles and Bones Bearings all use their own systems to rate their bearings. This might seem fishy, but it's actually a very good thing. Most bearings used in skateboards were never designed with skateboarding in mind! These companies have developed and built their bearings specifically for skateboards, and they get a lot of respect in the skateboard community because of this.

I hope this explains what [abec 11 bearings] means, and that you now have a better understanding. If you have any questions that weren't covered here, please feel free to write me and ask!

Daddies has searched far and wide to find a high quality skateboard bearing for a ridiculously low price! While traveling on the outer edge of the milky way the DBS crew came across these killer double shielded ABEC 11 bearings. We quickly mounted these puppies up and took them for a spin. All we can say is cosmic baby! 

Here's the tech specs for all you scientists:

ABEC 11 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 ina 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

Ceramic Orange Seal Fishing Reel bearing four packs are an upgrade replacement to stock fishing reel bearings. These ABEC 11 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 skf bearings are supplied lube dry (LD), no grease or oil. Lube can be supplied upon request.