TThoughtfully designed for ease of use. A silicone wrapped steel interior rim runs the perimeter of the tray to provide strength and rigidity for easily filling and mess-free transport to the freezer. Peak sphere ice mold makes four large 2" spheres. The large surface area makes the cube slow-melting, keeping frozen longer for slow sippers. Also great for popping into pitchers and punch bowls for festive chilling! This product is also great for creating beautiful ices to brighten up cocktails or even just everyday water - try mixing in herbs like mint, pieces of fruit, or freezing whole spheres of juice.