This is one pencil grip (cap/fastener) to secure the pencil for the Shukkudai Yaruki Pen. It's convenient to have a replacement part when the grip is lost or cracked, preventing the pencil from being secured to the main body. Purchased officially from KOKUYO, it was a set of 4 for 1,350 yen including shipping. I bought it for my child, but I have extras, so I'm offering them for sale. It will be placed in a separate bag and delivered via anonymous Mercari shipping! - Brand: KOKUYO - Product Name: Shukkudai Yaruki Pen - Color: Pink - Purpose: Pencil Grip Thank you for looking.