You'll receive assembled wooden frame (like on the picture)
All you have to do, is to stretch your canvas over the frame and use stapler to fix canvas on the back side of the frame.
That's it :)
5pcs frame set
Size1: 20x30cm x2, 20x40cm x2, 20x50cm x1
Size2: 30x40cm x2, 30x60cm x2, 30x80cm x1
Size3: 40x60cm x2, 40x80cm x2, 40x100cm x1