Contents include four (4) additional Avid Sleeves that fit on the Avid Premier Motor. (The standard system comes with four (4) sleeves. This is an accessory item. You must purchase at least one (1) Avid Hygiene Handpiece System (SKU 25.5.1) prior to purchasing extra sleeves. If you purchase one Avid Hygiene Handpiece system (25.5.1) and one package of the Avid Sleeves (25.5.2) per operatory, you will have the equivalent of eight (8) hygiene motors at a cost of less than $175.00 per effective handpiece. Think of how much less time you will spend maintaining and sterilizing your hygiene handpieces throughout the day. Operational Cost Savings! 25.5.2 Avid Sleeves (set of 4)