Includes 2 silicone ice molds. Diameter 2.75”. Yields 2.5” diameter ice ball. Flexible silicone freezes evenly and allows for easy removal. BPA-free. Tips: Leave extra space when filling mold to create flat, stable surface at the bottom of the ball. To avoid separation, ensure that ball is dry and that there is no water between halves. When frozen, peel off each silicone half and insert into drink with tongs. To avoid cracking, do not pour drink over ball.