Bones Reds 7mm
Bones Swiss Skate(-board) bearings have the best reputation in the skateboard industry, and have had this honor for the past 34 years because of their performance and quality.
Everyone who rides these bearings knows how fast they are, and most also comment on how long they last, typically several times as long as low cost bearings.
The 7mm edition, and comes in a box of 16 bearings per package.