The bearings are 608ZZ sealed bearings. The same bearing most inline skates and skate boards use. Go to ebay and search for inline skate or skateboard bearings and you'll find many sellers for them. I was recently looking myself and found 1 seller who was selling 8 bearings for $4.99 with free shipping. I've never changed the bearings, but from my understanding from others that have, you'll need a two jaw puller.