I bought these to mold small appetizers and snacks like fat bombs. They worked perfectly on the first use.The silicone is very soft and flexible. To fill them, you will need to place them on a tray or other firm surface (according to the needs of your project). Their flexibility is why it's so easy to pop out the finished product. Once chilled and firm, all the small snacks unmolded easily at the push of a finger. Chocolate bombs came out with a nice shiny surface. The cheese bombs were not as smooth, but I didn't push the mixture into the molds especially firmly.They measure 1.5" - 1.75" edge-to-edge across the surface of the mold, depending on the design. I didn't measure the depth. Volume averages 1 tablespoon (3 teaspoons); some of the deeper round ones hold 4 teaspoons, and the smallest one - the star - holds a bit less than 1 tablespoon.There was some odor to the silicone when they arrived. As the manufacturer recommends, I washed them in hot soapy water and let them air dry overnight. The odor was gone in the morning. I store them in the ziploc bag they came in, and they still smell fine. The chocolate left a scent for a while after unmolding, but I don't expect it to last.Great product, and I expect to get plenty of use out of them.