The sensory mats are in square shape, PVC material, with TPR anti- slipmat backing, they feature colourful liquids inside. They create a true sensory experience as children stand, press and jump on the tiles. These floor tiles create a fun environment as children see cause and effect of the internal liquids moving. Best to use on a flat and even surface rather than on a slippery or smooth surface. Max User Weight: 120kg. Contents: 4x Play Factory Liquid Sensory Floor Play Tiles. Dimensions: 30L x 30W cm. Clean with mild disinfectants and detergents.