Features: 1. Hook line pen: There are 9 sets of line pens, 10 sets of line pens, and 11 sets of line pens to choose from, and the number is sufficient to meet different needs. 2. Soft bristles: Not easy to split, not easy to lose hair, moderate elasticity, full ink storage, good elasticity, not easy to deform. 3. Durable material: Made of birch (rod), aluminum (tube) material, polished smooth without burrs, durable and not easy to break. 4. Long handle: The pen holder is comfortable to hold, lightweight pen holder, smooth and smooth painting, shiny lacquer surface, good hand feeling. 5. Wide range of application: It can be used for stroke and line drawing programs such as gouache and watercolor, suitable for professionals and beginners. Specification: Product Name: Hook Line Pen Color: Blue Materials: Birch (rod), Aluminium (tube) Size: About 00000#: 17.9 cm/7.05 inch (total length), 0.6 cm/0.24 inch (peak length), 0.1cm/0.04inch (caliber) 000#: 18.2 cm/7.17 inch (overall length), 0.7 cm/0.28 inch (peak length), 0.1 cm/0.04 inch (caliber) 00#: 18.3 cm/7.20 inch (overall length), 0.9 cm/0.35 inch (peak length), 0.1 cm/0.04 inch (caliber) 0#: 18.5 cm/7.28 inch (overall length), 0.9 cm/0.35 inch (peak length), 0.15 cm/0.06 inch (caliber) 1#: 18.6 cm/7.32 inch (overall length), 1.2 cm/0.47 inch (peak length), 0.2 cm/0.08 inch (caliber) 2#: 18.7 cm/7.36 inch (overall length), 1.2 cm/0.47 inch (peak length), 0.2 cm/0.08 inch (caliber) 3#: 18.8 cm/7.40 inch (overall length), 1.4 cm/0.55 inch (peak length), 0.2 cm/0.08 inch (caliber) 4#: 19 cm/7.48 inch (overall length), 1.7 cm/0.67 inch (peak length), 0.3 cm/0.12 inch (caliber) 5#: 19.1 cm/7.52 inch (overall length), 1.9 cm/0.75 inch (peak length), 0.3 cm/0.12 inch (caliber) 6#: 19.3 cm/7.60 inch (overall length), 2 cm/0.79 inch (peak length), 0.35 cm/0.14 inch (caliber) 7#: 19.5 cm/7.68 inch (overall length), 2.2 cm/0.87 inch (peak length), 0.35 cm/0.14 inch (caliber) Pcs: 9pcs, 10pcs, 11pcs The package includes: 9Pcs/set x Hook Line Pen (000-6) Or 10Pcs/set x Hook Line Pen (000-7) Or 11Pcs/set x Hook Line Pen (00000-7) Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.