🐹 CHEW-PROOF! New metal cup design is suitable for small animals (rabbits, ferrets, guinea pigs, hedgehogs, chinchillas, hamsters, rats, mice, etc.) that would usually chew through anything plastic. 🦔 METAL DRINKING CUP AUTOMATICALLY REFILLS ON ITS OWN! No need to push any tabs. The drinking cup automatically replenishes itself with clean water and always remains half-full encouraging animals to drink more naturally, like they are drinking from a pond or bowl! 🐰 EASY! EASY! EASY! Water bottle easily attaches to outside of cage. Flip-cap cover on water bottle allows for easy refill; just fill from the top! Water level is viewable from the outside through the plastic. No need to remove bottle from cage!!! 🐁 1L (32oz) KIT INCLUDES: one BPA-free food-grade plastic water bottle, flip-cap cover, metal drinking cup with long elbow attachment, metal clip, spring clip, instructions. 🐁 2L (64oz) KIT INCLUDES: One Patent Pending 2L (64oz) BPA-free food-grade plastic water bottle, flip-cap cover, metal drinking cup with elbow attachment, universal spring clip, instructions and customer service in case you have any additional questions!