NoGoo Nonstick Containers are the perfect storage device for your concentrates. They are made from 100% silicone and don't leave behind any sticky substance or residue. That means you'll be able to use 100% of your concentrate with absolutely no waste. The reusable containers are heat resistant up to 450 degrees and are Freezer/Microwave/Dishwasher safe. Each pack contains five 7ml containers in the following colors: Blue, Green, Orange, Red, and Yellow.