student zhengzi pen 0.38 0.5mm ming straight tip writing practice iridium pen ink sac ink dual-use

pink & white matte black orange red sapphire blue pure white blue and white charming purple bright black fluorescent green bright yellow transparent macarons blue macaron pink macaron green bright red purple + white gray + white morandi green morandi pink morandi blue retro green retro red retro blue green + white macaron purple

0.38 ef tip (free suction moqi) 0.5 f tip (free suction moqi)