Polytrays Assorted Disposable, colour coded transparent impression trays. Ash Polytrays are supplied in boxes of 25 of one type, or in an assorted pack containing 4 trays of each, in three sizes, upper and lower. Lowers are able to be sectioned and used for small partials with the handle and nylon adaptor supplied. Contains 4 trays of each in three sizes upper and lower. Box of 24 Usage: