For tracing paper, vellum drawing paper, and lineboard. The isograph has a refillable ink reservoir. Its innovative push-on sleeve allows for easy access to the ink helix for fast cleaning. Contents: 3 isograph pens (0.25, 0.35, 0.5), 1 Tikky (burgundy) 0.5, 12 hi-polymer HB leads, 1 B20 eraser, 1 bottle of ink (23ml), 1 compass attachment.