Item: 5 x 11 x 4 Ball Bearings
Type: Deep Groove Ball Bearings
Balls: Ceramic
Material: Chrome Steel
Closures: 2 Rubber Seals
5 x 11 x 4 ABEC-5 Ball Bearings With Ceramic balls 10 Ball Bearings
5 x 11 x 4 ABEC-5 Ball Bearings With Ceramic balls, Bearings are made of Chrome Steel With Ceramic balls, each bearing has 2 Rubber Seal to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.
Rc heli smoother quieter and better battery time. Just wish they were cheaper as I have already used the 20 bearings form the order. Buying a set for the road bike too.