Automatical Inking: Calligraphy set can automatically ink the matching pen with a press, very suitable for students or the first time using the pen crowd.Fast to Refill the Ink: When you run out of ink while writing, you won't be interrupted by the calligraphy kit. It only takes 15 seconds to fill a pen.Reusable Pen: When the pen and ink are used up, we can use our matching ink replenishing device to replenish ink directly at the interface, so as to realize the recycling of pen and ink.Superior Texture: Pen ink kit are constructed from ABS material. They are harmless, lightweight, durable, and will not cause any harm to the human body.Simple to Use: Insert the ink spout of pen ink into the automatic ink suction device, hold the pen in hand and the suction device in the other, press gently and wait a few moments to finish the pen and ink.