15Pack Foam Core Board, 11”x15” Black Foam Board, 3/16” / 5MM Thick Mat Board Center, Foam Backing Boards for Mounting Photographs and Artwork, 3-D Modeling, Signage, Poster Making

Adhesion is not applicable, since these didn't include adhesive. They are very foamcore! These are so foamcore, everything else is nocore. I used it for a foamcore craft project. Reliability is excellent. Durability is so far, so good. I haven't been keeping close track of time, I'd estimate about a few weeks of light use.

They are smaller than they appear in the photos, and I ended up buying a second box. They perfectly black out the window in my second bedroom, which is also where I film my content, so if you are ballin on a budget and need to blackout a window, this is a pretty solid way to do so.

The board is sturdy, arrived with good packaging to prevent bent corners. The black color is not Mat and has a bright reflection. Was used for photography, but the lighting needs to adjusted to prevent a reflected glare.

Decent foam core, black core and faces. Maybe a little more delicate than you find with typical foam core, but it looks nice and will work great on the project I bought it for. No issues cutting except the typical pilling/tearing/catching if you force the blade or whatnot.

Nothing wrong at all with these boards, worked out very well. The problem is, Amazon shipped them in an unprotected bag mailer, and 5 of the boards came completely ruined with big dents in them. Be aware of this when purchasing.