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.