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This log bunk set is patterned after the type used in the Pacific Northwest, primarily on what we term as a Long Logger. The tops are the gun barrel pipe extension type. TIp: Shave off the tops, and then drill a hole and insert tubing to desired length for more realism and customization. Printing parameters limited this from my end. Question or comment, contact me via the designer link or direct via email to firstname.lastname@example.org