Pilot Ballpoint Pen Refill BTRF-8EF-B, 10 pieces Manufacturer Discontinued 0.5mm refill for Pilot low-viscosity oil-based multi-color ballpoint pens Product Description This is a refill for Pilot's low-viscosity oil-based ink. It can be used in the body of a multi-color ballpoint pen. It's easy to refill, and you can continue to use the pen body, making it environmentally friendly and economical. Product Details Representative Product Code: 4902505325809 Material: Oil-based ink Product Size: Overall length 87.7mm x Maximum diameter 3.07mm Other Specifications: (Part number) BTRF8EFB (Weight) 0.73g