Wall damage from darts clusters in a fairly narrow band just outside the wires, and 3.8 square feet of foam covers that band without covering half the wall in foam. This surround drops straight over a board that is already hung, so nothing about your existing setup has to change. It is light, so no bracket or batten is needed behind it. And because both faces are usable, the day one side looks tired you simply turn the ring around and keep throwing.
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