The included silicone lid liners are also compatible with Ball and Mainstays plastic caps, Mason Jar Lifestyle stainless steel lids, and most other Mason jar lids. They even work well with just a metal band! Both the plastic lid and the silicone liner are dishwasher and freezer safe. Each box has one Bright Blue, one Charcoal Gray, one Mint Green, one Light Coral, and one Lemon Yellow lid. Platinum cured silicone is more expensive and higher purity than standard peroxide cured silicone. It meets both FDA and the stricter European LFGB standards.