【High Quality】the outer shell of the retractable pen refill adopts reliable metal, durable and sturdy, and the inner ink is made of quality material, which has high color rendering and even fluidity, providing you with a smooth writing experience 【1mm Black Pen Refills】Fine ballpoint pen refills Built-in precision ink output regulator, which can ensure liquid ink flows evenly giving ,are perfect for drawing, writing, sketching, and illustrating 【Convenient To Use】The ballpoint pen refill is portable and practical, convenient to carry, with a protective cover on the head of the refill, you can put it in your pocket without worrying about Ink leaking, the pocket size is easier for storing 【Package Content】contains 10 pcs of black replaceable pen refills, each measures 3.9 inch/ 9.9 cm in length, 1.0 mm medium point for smooth writing; A large amount of pen refills are enough for your use 【Widely Application】 The ballpoint pen refill can fit most ballpoint pens for use in different scenarios, can even be given as a gift to friends, family, children and students