1: 20 pack 0.5 mm gel pens blue ink,meet your demands of daily writing, You will love this style of super quick-drying pens smooth writing pens once you try it 2：GP-380 gel pen, blue gel pens ,signature pen and gel ink pen are very suitable for students' stationery and office supplies. 3：0.5 mm high-precision metal nib, with good wear resistance, the pen holder is frosted rubber, the thickness of the pen body is moderate, and the pen holder is ergonomically designed, which makes it feel comfortable. 4： The high-quality blue ink in the pen is pure in color, which can produce fast-drying and colorfast writing effect, and is waterproof and sun-proof. 5: When you use it for the first time, turn it a few times to let the ink flow out smoothly. Blue gel pen uses a 5.1-inch size refill. GP-380 gel pen has been loved by users for a long time. It is simple and easy to use, comfortable to hold, high-quality ink and fluent in writing. It is suitable for students and various office occasions, as well as for keeping diaries and drawing sketches, and its writing fluency is unparalleled.