This ruyao glaze is known as "moon white" 月白 yuebai for its pale milky translucent color.
This is handmade by Master Lee ShanMing 李善明. He has devoted himself to ru kiln products for over 15 years. His signature is on the bottom of the cup, it says "Shan ". "Shan" is the middle character of the artist's name, it means kindness, "yin" means to hide yourself. "Shan Yin" describes the philosophy of the artist, which is to be kind and to be low key.
All pieces are delivered in a gift box and include the collector's certificate with Mr.Lee's signature.