Front of frame snaps on to back. Back has piece that snaps into multiboard. I created 2 backs incase your frame needs to be centered in a spot where you have even holes instead of odd holes, just in case. This works great on the GachaPop from Hybee3D for signage! I used PETG to print mine just because it holds up a little better. Snaps are snug so it works best to push from the back when removing the frame. The front does not snap SNUG, it's just enough to hold a photo or piece of paper in place.