The Unique rollerball wood MMc is a Rollerball pen in an exquisit design. Material and surface: Tip: brass chrom plated. Barrel: nutwood. Cap: brass chrom plated. Clip: steel chrome plated. Standard colours: Barrel: nutwood. Special colours: - Refill: Rollerball refill RO-S (600 - 800 m), blue or black, Refill Optional: