Ash Polytrays are supplied in boxes of 25 of one type, or in an Assorted pack containing 4 trays of each, in three colour-coded sizes, upper and lower. Compatible with all alginate and elastomeric impression materials and their adhesives. They are designed for single use only and are ideal for the open tray technique when taking an impression for implants. Lowers are able to be sectioned and used for small partials with the handle and nylon adaptor supplied.