high-quality materials: aokung profession basketball system is constructed of heavy-duty steel, durable polycarbonate backboard, and an all-weather nylon net. this basketball hoop is designed to last through many basketball seasons, and the transparent shatterproof polycarbonate backboard, stable base: the mobile base can be filled with water or sand to ensure your safety and stability when shooting the basket. two built-in wheels provide convenience for transportation and movement. height-adjustable junior basketball hoop: the height of the basketball hoop can be adjusted from 5.6ft to 7 ft, suitable for boys and girls of different ages to practice basketball. this products also is swimming poor basketball hoop, suitable for adults and kids..syi