-Made of high-strength HDPE material waterproof aging-resistant durable enough-Designed with 4 large refillable reservoirs enhance wind resistance and stability-Designed with 4 plates easy installation no tools are required -The interlocking plates do not require metal pins for locking-The bottom ventilated holes increase friction for greater stability-Comes with grooved handles on the bottom easy to move around-4 plates can be stacked for space-saving storage when not in use-Suitable for most p