WATERCOLOR PAPER POSTCARDS, PERFECT FOR PAINTING ARTS: This watercolor postcards are made of 100% cotton, 24 sheets in total, each sheet measures 4.1x5.9 inches, paper weights 140lb (300gsm), which can better absorb colors of pigments without causing a drip or leak. Its surface withstands scraping, and repeated washes, making it highly suitable for better paint performance and durability. We developed a metal box that is reusable to decorate an artist's studio, arrange materials, or make a beautiful gift box.

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