Ikea Ice Cube Tray (2 Pack) Flexible Synthetic Rubber Makes ice sticks that can actually fit into your bottle Stackable, Made from Dishwasher Safe Synthetic Rubber Only Intended to Be Filled With Water Dimensions: 7" L x 7" W x 1" H, 18cm x 18cm x 2.5cm Designed by IKEA of Sweden, Made in Republic of China