Siliocone mold for a round disc with ribbed edge. The disc is 15 cm (6") wide and 8 mm (1/3") thick.
There are also molds available for a larger ribbed edge tray of 25 cm (10") and for ribbed edge coasters and matching coaster holder, see one of the pictures (for illustrative purposes, this item is only for the 15 cm round disc mold).
