Premium writing instrument engineered for precision and comfort. The Hauser Sonic 0.55mm gel pen delivers smooth, waterproof black ink ideal for note-taking, exams, and daily use. German-engineered technology ensures consistent flow without skipping or smudging. Refillable design reduces waste and offers long-term value. Each set includes 10 pens, perfect for students, professionals, and institutions. The fine 0.55mm tip provides crisp, legible writing on all paper types. Durable construction withstands regular use in classrooms, offices, and on-the-go environments.