The Single Dual-Level SUP Wall Mounted Rack can be quickly and securely attached to the mounting bracket by just pushing in a push pin. One unique feature of the arms is that they can be mounted upside down or right side up. When mounting the arms right side up, the arm will be angled up 15 degrees relative to the horizon. When mounting upside down, the arms will be angled up at about 5 degrees (almost horizontal). The arms are equally strong mounted in either position, so picking how you want it is simply a matter of preference. The arms are completely covered in 0.33" thick closed-cell foam. This is a premium quality foam that is designed to take a heavy board without causing any scuffing or pressure point distortion. This foam allows you to keep your board in the rack in the offseason without fear of distorting your wake surfboard.