Sphere Ice Molds are Made of Clear Silicone and Make an Ice Ball Mold 2.5 Inch, Set of 2 Each ice sphere mold holds 5 ounces and measures a 2.5 inch ice ball, with silicone caps that provide a Leak-free seal Ice molds Stack neatly to conserve space and won't tip in the freezer Ultra slow melting ice spheres quickly cool your drink without watering it down Dishwasher safe and BPA Free Ice Ball Molds Free Lifetime Warranty