You'll love these bowls! Bowls are NOT sanded and polished on the outside which gives them this beautiful rustic look and authenstic vibes (*). You can serve both cold and warm foods in these bowls. Wash them with lukewarm soapy water, put on some coconut oil (linseed or flaxseed oil also work) to hydrate your bowls and restore their shine and smooth surface. Do not oven or microwave, do not place in the dishwasher.Made of real coconut shells: 100% natural, free of BPA, toxins, synthetics, and plastics. * If you want to give these bowls a more polished look, you'll only need to use some sand paper and coconut oil to finish them as your own.