The mf8 Crazy Pentahedron - Mercury is a 5 sided puzzle by mf8. This particular version has circular cutouts on two opposite faces with one of them being stationary relative to the side that they're on.
In the graphic listed, sides labeled '1' have circular cutouts that rotate with the face, sides labeled '0' have cutouts that do not rotate with the face.
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Please note that some new cubes when being used for the first few times may experience what is termed a "pop". This is when one or more parts of a puzzle pop out without any damage actually being done to any of the pieces. This also occurs from time to time during normal usage. Pops are typically not considered a defect if the parts which come off can be reassembled by hand.
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Pretty fun solve! Not too easy, but also not too hard -- you should be able to figure it out if you've solved a cuboid before; the methods don't exactly correspond but they're similar. Locked up quite a bit at first, especially the side with the locked circle (yellow I think), but it turned out it just needed to be broken in. Still a little hard to turn occasionally, but since it's not really meant to be speedsolved anyway that's fine. I've been playing with it quite a bit since I got it, and I am now curious to see what the differences and similarities are in the other Crazy Pentahedron solves (the Mercury is the only one I bought), so I'm putting the other variations on my wishlist (unless I decide to buy them on my own first).