Mine are wood boards hung by using the metal channel rods.
You can buy everything at lowes or Home Depo. You can buy the boards and then you use a jig saw to round the edge. You can either buy the fancy white boards they have in the closet organization section or you can buy wooden boards and stain them.
I've done both options. My ponies have wood stained boards since we have wood paneling in the house. My craft garage has the fancy white boards since the walls are painted - I have my doll collection displayed there.
You can buy the rods in the same section they have the closet organization things in. You'll need screws to put them up and someone who knows how to hang them on the wall. Then you buy the little hooks that you stick in the channel rod, depending on how many shelves you want and how long your shelf is will depend on how many hooks you need. They both have the white and think dark metal hooks. You can basicly decide what you like better to fit your decor.
Here is the shelving unit my dad has for his race cars
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loginHere is the shelving for my ponies
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