Options: Variations: 88K8351 - Bushing Set for New Series Rollerball & Fountain Pen Hardware 1 - $8.00 10 - $6.80 25 - $6.00 50 - $5.60 Bushing Set for New Series Rollerball & Fountain Pen Hardware These soft-iron bushings are specifically sized to match the brass sleeves in our New Series rollerball and fountain pen hardware kits.