• Size: 9.8cm/3.85 inch Black Refills for stylus 2 in1 pen.
• Suitability: Please check the type of ballpoint pen in the picture, it is a 2 in 1 Stylus pen, however the refill may fit other generic pens as well. 
• The diameter of the pen is 2mm
• Attention: Before purchasing, please measure whether the refill of your pen matches.