The Cannon Percussion Deluxe Cymbal sleeves incorporate the washer into the sleeve. Incorporating the washer into the sleeve then removes the need for the metal washer completely and also eliminates the risk of metal to metal contact between the cymbal and the washer. This type of contact between the cymbal and washer can be disastrous in terms of scratches or worse, cracks. Protect your investment; get Cannon percussion 8mm Deluxe Cymbal sleeves.