Gelato Disposable Foam Single Arch Fluoride Tray, Medium Size, Package of 100 Trays. Gelato. Single arch. 100 pk. Medium. These Gelato Fluoride Trays have an anatomical design for a comfortable fit and high walls to inhibit gel overflow and fluoride ingestion. Special design allows the effective delivery of gel to the interproximal and occlusal area.The contoured shape increase comfort and reduces gagging reflex associated with fluoride application. Available in bags of 100.