There are two types of schooling standards, notice the design of the bottoms are different. The white standard is three sided on the bottom allowing the walls to be flush with the standards and centered. The four sided standard is available with heavy duty bolts and the edges are rounded. The standards are very stable, easy to carry. Available in pressure treated natural or top quality pine which is primed and painted to any color of your choice. Tops are are angled and sanded.