Comfortable Rolling Beach Trolley Wheel Pair Made from Quality Materials. Made of PVC material, durability and functional. Wide tire surfacing, soft and full, easy to install, tread width of 115mm (4.5inch), can well prevent the trolley from sinking into the sand when used on the beach or grass. The center axis hole diameter of the wheel is 8.5mm (0.33inch), please confirm the size before purchasing. Normal range of inflation pressure: 2-4PSI (0.14-0.27BAR). Multi-purpose, very suitable for beach camping trolley wheel replacement. Product Name: Beach Balloon Wheel. Diameter: 205mm (8.1inch). Thickness: 115mm (4.5inch). Inner diameter: 8.5mm (0.33inch). 2 x Beach Balloon Wheel. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Please allow slight manual measurement deviation for the data(1cm=0.39inch). Please kindly note that. Also, the each additional item means. The the same color and size. Transit time may be a little delayed because of the. If you have any questions.