The rolling portable pole sign holders are made from rustproof plastic technopolymers designed to withstand harsh environments. Whether it’s snow, rain, sleet, or summer heat, the holders won't fracture, break or degrade. The heavy-duty base and split flanged bushing provide sturdy support to the signpost and facilitate stability when subjected to wind loads of up to 40 mph. For additional weight and stability in windy conditions, you may add water, sand, or gravel in the ballast ports at the base of the sign holder. The ballast port has a capacity of 2.5 gallons, adding an extra 19-21 lbs of weight. These portable do not enter signs are perfect for parking lots and any other areas where temporary entry restrictions apply.