This Paterson Developing Tray is constructed of a hard durable, chemical resistant plastic, and is available for all popular print sizes in 3 colours to help differentiate between chemicals under safelight conditions. The trays base design gives maximum economy of solution and easy print removal, with a convenient pouring lip for drip-free emptying. They are available individually or in sets of 3 with one of each colour. Stackable for easy storage Six different sizes available: 5×7in Single gray tray that is 7 x 9in (17.8 x 22.9cm) in dimension, for prints sizes up to 5 x 7in. 8×10in Single tray that is 10 x 12in (25.4 x 30.5cm) in dimension, for prints sizes up to 8 x 10in. 10×12in Single tray that is 12 x 14in (30.5 x 35.6cm ) in dimension. 12×16in Single tray that is 15 x 19.5in (38.1 x 49.5cm) in dimension, for prints sizes up to 11 x 14in. 16×20in Single tray that is 18.5 x 22.5in (47 x 57.2cm ) in dimension, for prints sizes up to 16 x 20in. 20×24in Single tray that measures 24 x 28in (61 x 71.1cm) and is designed to accommodate print sizes up to 20 x 24in. CLICK HERE for details, specs & description on manufacturers site.