MDF

REPLACEABLE TARGET BACKING. I build my pellet traps with a 3 sided open top frame on the front of the trap to hold a piece of card board I can replace easily when it is shot up too much . I can slide it up and out, I learned to make the frame deep enough to hold 2 pieces of cardboard so I can remove one and replace it with a new one while the second one retains the rubber mulch in my trap box.

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This right here is what brought me to my "Easy rubber mulch target build" the tote can be placed on it's back, lid comes off easy, replace the cardboard with a fresh one, replace lid (which stays under a little tension) and you are good to go again. I had build a very heavy duty one out of 2x4s and 2x6s with the same sliding feature, but it ultimately did not work the way I had hoped. Using the 2 pieces is pretty smart idea though.