Constructed of antirust painted iron posts measuring 3.8cm/1.5inch in diameter . shatterproof PVC . PE backboard . and durable nylon net . quality materials to ensure lightweight and good durability as well. We listened to our customers’ reviews and upgraded the stability. Compared with the previous oval posts . this new stand uses round posts and has a knob for extra stability. Besides . the base is larger and sturdier for double safety. The 83 x 56 cm/32.7 x 22″ (l x w) tank base can be weighted with water or sand to ensure for your every shot. It is equipped with two 10cm/4″ big wheels for effortless moving.