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Why is there a hole at the bottom of the cat's paw cup?
That hole is explosion-proof to prevent the middle layer of air from expanding with heat and causing an explosion.

The cat's paw cup, an Internet buzzword, is a limited edition pink cat's paw double-layer glass cup that Starbucks put on sale in stores on February 26, 2019, with many people queuing up all night long to buy the cups because of their unique shape and limited quantity. It is priced at 199 yuan.

The cat's paw cup is made of transparent glass, the inner layer of the cup is designed in the shape of a cat's paw, and the outer layer is printed with a pattern of cherry blossoms, and the shape of the cat's paw emerges when a colored liquid is poured inside.