R&R Oscillating Disposable Prophy Angles are supplied with soft, rubber prophy cups in bags of 100/pk. The R&R's are pre-lubricated and iM3's unique blue color is your guarantee of the prophy angle lasting a complete procedure! The 90-degree reciprocating 'back and forth' action of the prophy cup prevents muzzle hair from being tangled and allows the cup to have continuous contact on the tooth surface. The reciprocating action also reduces heat and friction on the tooth and doesn't splatter prophy paste. Guaranteed not to catch hair or whiskers.