Native Treasure - Smooth Arabica Puka Shell Necklace - 6mm (1/4") - 18" Inch Standard 18" Length. MORE Sizes in Our Store! 6mm (1/4") Super Class 'A' Quality Shells Hand-Crafted in Our Tropical Jewelry Shop by Our Native Island Artisans Includes FREE Stainless Steel Beading Wire Upgrade, Sturdy Twist-Barrel Lock 60 Day Free Breakage Replacement 100% Satisfaction Guarantee