13.98 ± 0.03 mm 6 MHz Plano-Convex Gold (Cr / Au)
13.98 ± 0.03 mm 6 MHz Plano-Convex Silver (Ag)
13.98 ± 0.03 mm 6 MHz Plano-Convex Alloy
13.98 ± 0.03 mm 6 MHz Plano-Convex EverLife Gold (Cr / Au)
