Anti-slip Offset Quadrant shower trays. Offset Quadrant Corner none-slip shower trays are perfect for use with Offset Quadrant Shower enclosures to give a safe showering experence. At Rubberduck Bathrooms we offer a variety of anti-slip Offset quadrant shower trays in a vast range of sizes. Our range of quadrant anti-slip shower trays Shower Trays provide both style and functionality to your showering space. Anti-slip shower trays are perfect for people who are worried about slipping over in the shower.