Made to our specs and 4 microns thick. Japanese writing on peel off strip.

330mm wide. 315mm to the top of sleeve, with 50mm flap (365mm overall length, top to bottom, without flap folded over). Gummy strip is 295mm from the bottom.Resealable 12" 4 micron Sleeves 100

We import these directly from Japan, no middleman. As far as we can tell, these are only made in Japan. Accept no substitutes.