The falling core type automatically produces the core by the gravity of the core. The rotary type conveys the core by rotation. The pulsating type (pushing type) conveys the core by pressing, and the structure has a single pressing type, that is, the core is delivered by pressing once. The double-pr...

Are crayons safe? Crayons are made up of solvents, solvent-soluble polymers, glass pigments, and gelling agents. Many chemicals are added during the production process. If they are only used for drawing, as long as they are purchased from regular manufacturers, they are of good quality. All crayons ...

Mainly lies in the difference in shaping effects, materials, characteristics and strokes when painting 1. Create different effects when painting: crayons are not likely to be blurred by water, and they will have a soft and casual feeling when drawn. And the effect of drawing with different paper cra...

Painting type pens are various painting brushes that are attached to automatic plotters. Common ones are ink pens, ballpoint pens, nylon nibs, ink ballpoint pens, etc. Some plotters are equipped with painting type pens of different widths and colors. Specialized pen for drawing technical drawings. A...