This cap is specially designed to facilitate the use of your enrichment toys, they will prevent your animals' favorite toppings from spilling back on your table or in your freezer! They are compatible with all Sodapup sizes (S, M, L, XL). Two versions are available to you: Non-magnetic version Magnetic version. Usage advice: Install the plug. Stuff the toy with your pet's favorite food (liquid, pâté, cheese, etc.). Freeze (for more stability, we recommend our specially designed supports). Remove the cap before providing the toy to your pet. Materials: The caps are made from 100% recyclable material (PETG). The material is certified “food contact” (ROHS and REACH environmental standards). Interview: Dishwasher compatible (delicate program). The color may vary slightly from the photos. Toy not included Sold individually.