Never run out of ink again with these standard ballpoint pen refills, designed to fit Idlewild Co. Slim Pens (Rainbow or Pastels), City Pallet Pens and Retro Pens, as well as a variety of name-brand styles. Keep your favorite writing tools scribbling forever

• 4 black ink cartridge refills
• 5mm line weight
• Fits Idlewild Co. City Pallet Pens and the midcentury Retro Pens
• Plastic-free paperboard sleeve