Old carpet or what's left over from an install. . I cut the old stuff in strips and store it. Ge a big box from a furniture or appliance store and put the carpet over one side the face side in and the backingout. Then I use pieces of cardboard, old pie plate, pizza plates, pizza boxes, etc etc over the carpet for the actual target. You can draw rings, animals, etc on it.
I stuff the box with anything I can find, plastic bags, more old carpet old pad, packing, cardboard, etc etc. Arrows do not go thru.
Broadheads would cut it up more and be hard to remove. Use field point on this only.
Takes a lot of abuse, Maybe 100 or more arrows a day for 6 mos.
sam