1. [CREATE LUXURIOUS FROZEN DESSERTS]: Compatible with Ninja Creami Deluxe NC501, NC500 series ice cream makers. Easily mix your favorite frozen containers directly into the containers and seal with the leak-proof lids. Ensures not only optimal performance, but also the best value for ice cream loving families. 2. [LEAK-PROOF LIDS] Our lids are tight enough to keep the ice cream containers sealed, no more leaks or spills. The lid can isolate other odors from the freezer and preserve the taste of your ice cream, yogurt, sorbet or other frozen foods. 3. [4 CONTAINERS AND LIDS]: Compatible with Ninja Creami NC500 series Deluxe ice cream makers. Having the extra 4 containers is very practical. Because you can create more interesting and delicious frozen treats for your family or friends. 4. [REUSABLE & ECO-FRIENDLY]: Both containers and lids are BPA-free and dishwasher safe for easy cleaning after multiple uses. They are shatterproof and can be reused to make all sorts of interesting frozen treats. 5. [NOTE]: Compatible with Ninja Creami ice cream makers NC500 series. They will not work correctly with other blender models. Please check your ice cream maker's part number to ensure compatibility before purchasing.