Don't waste your money on this. Pieces of wood (very cheap, pine 1 x 3 x maybe 1/8 inch). Instead, you can use any sip you like. 2) - 1 strip of flannel that was too small for both trees I wanted to use. I haven't seen any warnings on the website, but this doesn't work on large diameter trees. I'm over 24 inches in diameter. went to walmart and bought the same stuff for a dollar. I don't think they will last long. These are standard velcro straps so they are not designed to withstand rain/temperature changes etc. I've been using them since I already bought them but I don't think they will last more than a season. Of course I hope that the zipline will last longer.
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