● Specifications: Crisp vibrant writing lines on the nib to the bottom to recover quickly and concentration. Its more than just oil. Its rain can have a tough create lasting ink pens refills. ◆ Material: Axis, cap: Play PP cap Nib: Polyester fiber ◆ writing line width: 2.1 mm ◆ Safety: ISO standards Compatible ◆ ink ingredients: Alcohol Series oil-based pigment