Is your mark tree missing a few bars because the ties broke? Grab this 24-pack of replacement ties and you'll be golden for quite some time. They're made of heavy-duty plastic.
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Simply thread one of these ties through the hole in the top of the bar or tube, and then through the corresponding hole in the "shelf". Attach the two ends of the tie and you're good to go.
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This tie is compatible with any mark tree with a shelf containing drilled holes.