Without ball-bearings skateboarding wouldn't have come very far and if it wasn't for Swedish Ball-bearing Factory SKF ball-bearings wouldn't function the way they do now. SKF pioneered the modern capped kind of bearings on which the whole planet is now spinning. When SKF began making bearings specifically for skateboarding the result was naturally exceptional and the fact that Andrew Reynolds is rolling on SKF is good proof of the durability and speed of these bearings.