The largest one has a diameter of 18.5 cm. The smallest one has a diameter of 11 cm. It can be used not only in the kitchen but also to erase writing on whiteboards. This is a handmade item. It has been stored by an amateur, but I do not smoke, and I do not have any pets. For shipping, it will be double-wrapped to prevent it from getting wet. Please note that it may be a little difficult to open. Instant purchase is welcome. Thank you.