12 Fine 0.4 mm. 12 medium 1.0 mm. New reusable case! Bold colors. Won't bleed (bold color that won't bleed through paper result could vary based in paper characteristics). Writes like a pen, bold like a marker! Fine 0.4 mm fine tip provides smooth, colorful precision. Metal nib protects tip from wearing down. Water-based ink makes it perfect for writing on paper. Medium: 10 mm medium tip provides colorful writing that stands out on paper. Smooth application. Water-based ink makes it perfect for writing on paper. Fine 0.5 mm. BIC Performance Policy (US and Canada): If not fully satisfied, return to BIC for product replacement. AP: ACMI Art & Creative Materials Institute Certified. Conforms to ASTM D 4236. www.bic.com. Add to your collection! Learn more about the BIC Intensity line and get inspired at www.bic.com. Made in Korea.