The uni Chalk Marker makes the world a little more colorful. As a liquid chalk marker, it is perfect for designing smooth surfaces such as windows, boards, plastic, and metal. It is truly an outdoor talent that withstands rain. The liquid chalk marker with a chisel tip is ideal for use on smooth surfaces like glass, mirrors, plastic, metal, and blackboards. It can also be used outdoors, as the color is weatherproof. The color can be easily wiped off all smooth surfaces with a damp cloth. Intense and vibrant colors.