This is my favorite soap mold. I make cold process soaps, and they pop out of these beautifully. The best part is that I don't have to cut any soap from a large loaf of soap. The bars are perfect and smooth each time. They look very professional. These plastic molds are a little thicker and a bit better quality than a different brand that I also use. They're very durable. I doubt that they'll break unless I purposely try to break them. I was hesitant to try plastic molds because I thought they would be brittle, but Mold Market soap molds are awesome. I have about a dozen of this bar shape, but I also have most of the other shapes that are sold here. I have many expensive silicone soap molds from various big companies, and I think these Mold Market plastic ones are preferable because the same shapes stack nicely inside each other, and they clean up easier because nothing gets left behind in the mold as long as you keep your soap in them long enough to harden. I have a slightly softer recipe, and I keep them in about a week. Melt and pour hardens within a few hours. Silicone can sometimes hold some scent from a previous project.