Japanese-made bottle cap for pets, usable from 18 months old, blue. - Brand: Randy - Product Name: JuicyCap - Target Age: 18 months and up - Compatible Mouth Diameter: 20-24mm - Color: Blue New, unused, and unopened. I bought these because washing water bottles was a hassle, and they were very convenient, so I bought several. Later, as my child grew, they became unnecessary, so I am selling them. There are few parts to wash, and it was very easy to use, as you could just attach it to a plastic bottle and drink. I purchased it from a co-op.