Bones Skateboard Bearing Cleaning Unit: Finally, a bearing cleaning unit brought to you by the bearing company by which all quality standards are measured. Bones has spent the last couple of years fine tuning and cutting the cost of their bearing cleaning unit to make it affordable to everyone. The Bones Skateboard Bearing Cleaning Unit is designed to clean up to 8 bearings at a time. They are separated on a pin by 7 spacers to insure good flow of the cleaning agent throughout all the bearings and allowing more room for the debris to work its way out.