The Magical Stick mini is convenient for watering small animals. It's compatible with 130ml bottles and easy to attach. - Product Name: Magical Stick mini - Application: For small animals - Capacity: Compatible with 130ml bottles - How to use: Attach to a bottle filled with water - Maintenance: Recommended replacement every 15L (3 months) I used this in my chinchilla's water bottle at home, and I'm selling one. This is a water improvement supplement for small animals like hamsters and squirrels, creating hydrogen water. Please give your little family good water to drink. Thank you for looking.