They have 4 holes and they are flat buttons. The back is plain natural wood.
5 Mixed Pink / Green Flower Wooden Buttons 30mm Round with 4 holes crafts sewing
9 large round wooden buttons 30mm. 3 each of 3 flower design flat 4 holes 3cm
3 large round pink / green wooden buttons 30mm flat 4 holes 3cm
8 large round brown / tan wooden buttons 4 each of 2 designs, 25mm flat 4 holes
10pcs 36L Sewing Buttons 7/8" Resin Round Flat 4-Hole Craft Buttons, Light Blue
20pcs Sewing Buttons 1/2" Resin Round Flat 4-Hole Craft Buttons, Black
