The Cross Spire Fountain Pen Black Ink Cartridge Refill. The Spire fountain pen cartridges is formulated to provide superior writing characteristics and complete compatibility with the unique, slender design of Spire. Six in a pack Please see other collection in Cross Fountain Pen. We also sell other Fountain Pen Reffil. ADDITIONAL INFO: Genuine Product from Cross. Buy from Authorized Major dealer Only, with confidence. Brand New Product. Guaranteed for quality.