Replacement mmRNA O-Rings for attaching the telescoping arms to the fixing elements of the upper and lower appliances. These O-Rings give the ability to remove and reattach the telescoping arms and are reusable. Qty - 10pcs * Note: The labs provide a bag of O-rings with each mmRNA appliance order. * A notable change has been made: the O-rings, which were previously black, are now transparent silicone. This modification is aimed at enhancing the functionality of our products *