This is a set of three watch straps: a mesh strap and an extension (expandable) strap. The fine mesh strap cost about 2000 yen, and the thicker mesh strap cost 2250 yen. The extension strap cost 2990 yen. All are compatible with 18mm lug widths. The extension strap is the type that pushes into the sides of the lugs and can accommodate approximately 16-21mm. However, the strap itself is 16mm wide, so I personally recommend it for watches with 16-18mm lug widths. The fine mesh strap shows some signs of use, but has been ultrasonically cleaned and stored. The thicker mesh strap was purchased but only tried on; it has never been worn. It didn't match the watch I intended it for, so I've kept it stored. The extension strap has been used about 15 times, and has also been cleaned and stored after changing the strap. I am selling these as part of organizing my watch collection. I plan to list other watch-related items as well. Please feel free to take a look at my other listings. Thank you.