I used these exactly once! For mysterious reasons, I didn't experience a lot of nipple issues with breastfeeding so I did not need these -- however, I know they are highly recommended! I kept them in the fridge so they'd be at the ready, and they got a bit tarnished. The Silverettes website advises to cleanwith a baking soda and water paste, which I will do before shipping. Standard size. No box, sorry.