Dansac Nova 2 Firm Convex Skin Barriers, Convexity depth (mm) 6 - All Types1536 15 Starter hole 15 mm (cut to fit) Max cut 23mm Ring Size 36mm Plateau B (Orange) 1536 20 Starter hole 20 mm (pre cut) Max cut 20mm Ring Size 36mm Plateau B (Orange) 1536 23 Starter hole 23 mm (pre cut) Max cut 23mm Ring Size 36mm Plateau B (Orange) 1543 15 Starter hole 15 mm (cut to fit) Max cut 30mm Ring Size 43mm Plateau C (Green) 1543 25 Starter hole 25 mm (pre cut) Max cut 25mm Ring Size 43mm Plateau C (Green) 1543 30 Starter hole 30 mm (pre