Two packs of 7ft zippers for temporary entry/exit of material, probably plastic. This was used on 6 mil thick plastic to make a temporary door for construction use. The zipper fits well, but to be safe I used a different tape to attach the zipper to the plastic. For my purposes, only one zipper was required to make a doorway through which the average person could pass without bending or crouching (assuming the zipper was set to its full length - seven feet from floor to top). One zipper makes the opening narrower than two zippers. If you need a wide opening, use both zippers. The material of the zipper is nylon or something similar, and the zipper itself is nylon and/or plastic as used in most zippers on almost everything. For now it seems sturdy enough to withstand daily heavy use without abuse! The seller packed it well along with other items. It was shipped via UPS and then turned over to USPS at the end of the trip, which is good for me. Many Thanks.
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