These board rack arms replace the OEM board rack arms for the illusion tower . There are three color options, bare aluminum, White and Black. These are made in the USA out of solid billet aluminum. They are 3/4 in thick and very sturdy and will not bend like the OEM racks. These will replace the rack arms and will bolt right on using the existing hardware. They have salt water resistant elastic Cord to Secure your boards. The board rack arms are lined 1/8 seadek to protect your boards. If the seadek wears out it will be cheap and easy to replace. These board racks arms will fit a kneeboard in the lower rack or you can double stack two surf boards in this position and one board in the upper postions. Ultimately you can fit 3 boards on one rack or a knee board and on surf board. When you purchase, you will get two new arms so it will replace one board rack. You will need to buy two if you want to replace both sides. As always, made in the USA!