This product is handmade, one by one. Consisting of three layer glass structure with soft glass sandwiched between hard glass layers. Only the inner soft glass cracks after a while due to the difference in shrinkage ratio. Three years after manufacture the cracks increase little by little. They are unique with its own glass manufacturing method and its aging process.

Material | Glass
Size | #1 BallSmall 2.56"φ x 2.56"H / #2 BallBig 3.15"φ x 2.95"H / #3 Hourglass 1.97"φ x 3.74"H
Country Of Origin | Japan

*** It takes approximately 1 to 2 weeks to deliver the products ***