Trays are super easy to fill. You just remove the cap, fill with water to the line, and freeze. Other trays have you filling through a little hole in the top and makes it very difficult
These are also stackable so you can save on space in your freezer! The frozen spheres are easily removed with the pull tab on the cap.They are easily washable and are made of food grade silicone and BPA free plastic. They are also dishwasher safe! Overall a great value and great product!
I received this product in exchange for my honest and unbiased review.