what is a clear 8x10 picture wall frame with no panel on the front called?

[My N]

i want to hang a few pictures on the wall...they are 8x10 and i dont want any panel whatsoever ...I saw this type of frame before where it lets you slide the picture in the case behind the hard plastic or glass or whatever so all you see when you hang it on the wall is the picture ...and the frame is about two inches thick ...but it has no panel that you can see from the front only around the edges that you could only see on the sides ....im looking for that with something that has no panel on the front ...maybe around the sides ...but not visable when you look at it straight ahead...i dont think its called a "floating frame" i dont know much about frames so could someone tell me the exact name of the frame im looking for? and maybe where to get some at a pretty low price...thank you very much