If you have a square enclosure, then you will need a square shower tray. The most important factor when choosing a tray is its dimensions. You need to choose one that matches your enclosure. At QS Supplies, we have a vast range of products to choose. Trays range in size from 700mm up to 1000mm. If you need a tray, large enough for two people then you need a rectangular base enclosure. A 700 x 700mm enclosure is small and a 1000 x 1000mm one is big enough. Most people choose enclosure in between these two extremes. It is easier to compare the features of different brands of trays using our website. Our website allows you to get an overview, but it is best to call in to make your final decision.