Each one is pretty unique in its shape, size and stitching, but the diameter is approximately 5.5" (14 cm). Typical color is shown in the images. If you want to change thread color, please, feel free to contact me.
Concerning the pattern, could be:
a.color thread just at the end (photo #4)
b.color thread all around
c. color thread in the center
Each piece is made to order, please allow up to 2 weeks for delivery.