High quality Silicone that is easy for using and cleaning. Perfect for smaller bath bombs as it is flexible and can be packed tightly. I use this mould for soaps and it is a fantastic hand soap size. Also can be used for actual food, candles or fun treats. Rating of temperature: -40 centigrade to+210 centigrade
For bath bombs make sure the bottoms of bath bombs are flat before turning over or cracking will occur.