Review on High-Quality Miniature Skateboard Bearings - 8X22X7mm Bearings for Smooth and Effortless Skating by Christopher Bates

I've used more expensive ones but these seem perfectly fine and are great for the price. It's nice to have enough on hand in case they break, which will happen on a regular basis. They might have a little more friction, but I don't think it's much at all. I haven't measured but can't tell if it affects the ride.