Food Grade Silicone;Heat Resistant Temperature -40 to +230 Centigrade (-40 to 446 F)Dimension:each cell appro:6.5cm x 6.5cm x 3.2cm(2.55" x 2.55" x 1.3");Color:Send randomly if no special noteFlexible and Reusable;Dishwasher-， refrigerator-， freezer- and microwave-safe