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Product name: Art groove ruler/boundary ruler
Specifications: 30cm/ 40cm
Material: plastic + metal
Product introduction: with grooves, suitable for comic painting, art creation
How to use: Hold two pens like holding chopsticks, one pen is used as a stand, slide along the groove of the ruler, and the other pen is used for painting, you can easily draw straight lines for fine brushwork, gouache rendering, and comics.
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