This mold is made of a sturdy silicone that is actually translucent/white, not blue as pictured, and produces very nice, clean bars. Cavities hold about 4.5oz of soap comfortably before starting to get overfull. The mold is very large and can be a bit unwieldy, so I actually cut it in half (for two 6-bar molds) to make them a bit maneuverable. Cutting into the mold hasn't had any negative effects on its structure or form. As a bonus, it's easy to clean!