Review on AmazonCommercial Silicone Trays Spherical Square by Amanda Lemons

The top and bottom halves that join together to form spheres have little to no seam that forms a seal, to get a solid sphere you need the entire Fill cavity with water so the weight will stop the balls from leaking and the water will fill the balls after the silicone's lack of rigidity causes a lot of spills on the way to the freezer. I would recommend a different product but if you are stubborn they will work