Please note, that this jewelry is handmade, and no two pairs will be the same. This gives you the unique detail to your charm and should not be considered a defect in craftsmanship.
Charms are raw brass and will eventually develop a lovely patina over time. If you wish to get rid of the patina, you can easily use steel wool, baking soda, lemon etc. to polish them up. Be sure not to go near water as well, as it can easily stain raw brass.