What kind of processing is the 'sandblast' mentioned in the description?

Sandblasting is a technique of spraying fine sand particles with strong compressed air to grind away the shiny gloss on the surface. By creating fine irregularities on the smooth glass surface, it produces a translucent and soft texture, like mist. Ishizuka Glass's My Family Tumbler applies this sandblast processing to the surface of the glass cup^[1][2].

Thanks to the soft texture, it is less slippery than the characteristic slickness of cold glass when held in the hand, but scratches easily if the surface touches a hard surface^[3]. Dragging it across a rough table or coming into contact with metal tableware can leave scratches, so it is recommended to place a coaster under it when putting the cup down and to use a soft sponge when washing.