Engravable Students Practice Calligraphy Pen Adult OfficeOverview: Correct writing posture Low price and high quality, smooth writing and not easy to break ink Visual window, you can see the remaining ink Specification: Color classification: yellow red purple fruit green blue Writing thickness: 0. 38mm 0. 5mm Packing method: plastic box Applicable scene: correct grip posture Fountain pen nib composition: iridium pen Nib type: Standard type Inking method: rotating ink absorption Pen barrel material: plastic