Low flow for use with regular formula, nothing thick. For thick recipe formula refer to Heavy flow feeding tower. Made with food grade silicone. Food grade silicone is 100% safe for puppies to eat out of. Wash before and after each use with boiling water. Small 150ML 4 nipplesLarge 300ML 5 nipples
 
Great for use with small breed and new born puppies. 
 
https://www.k9reproduction.com/product-page/heavy-flow-puppy-nursing-tower