Dsco hybrid bearings…

8 mm.
6 x Durable Steel Ball Bearings
1 x Self Cleaning Ceramic Ball Bearing
High Caliber Nylon Ball Cages
Frictionless Removable Rubber Shields
Speedy, Enduring, Clean Friendly.

Multicolour – 4 colours, blue, yellow, green and red.
These come in a pack of 16, so you only need 1 pack for quad rollerskates