Mashiko-yaki Free Cup Set of 2 Works by Natsumi Ota. Purchased a few years ago from the outlet corner at the Mashiko Pottery Fair. There are some black spots, but I don't think there will be any problems using them. Please check the photos. Also, there may be color unevenness unique to pottery. Please refrain from purchasing if you are concerned. I have sealed the pores and washed them, and stored them in the cupboard. They are very cute and wonderful. I haven't used them because I didn't want to. I am selling them to organize my collection. Thank you very much. (^^)