This teacup is designed with a tokusa pattern drawn by hand with a broom-like brush to make the thin blue lines centered in the middle of the cup.

Sorisencha is a word unique to the Hasami area used to describe teacups. "Sori" means that the mouth of the cup has an outward rim, and "sencha" is a local Hasami expression used to describe short teacups with a wide opening. 

This cup is light and easy to hold. And the thin porcelain with the outward rim gives a comforting touch to the mouth.