Specifications: The writing distance is long, so you can write well. ◆Ball Diameter: 0.03 inches (0.7 mm); Ink: Oil-based dye; Compatible products: Notebook, Planner Tuckar, Penguod, Cross Mode, Mina Japanese Pattern, IC Alfer; Art Supplies Shop Dot Com Postcard A; Limited Product!! 1 x Cute Animal Postcard