These Hardware Nail & Screw Sounds by Master Series are the perfect way for experienced sounding enthusiasts to explore texture. This kit comes with 2 pieces, one smooth hexagonal nail and a spiral-textured screw. Each rod is 6 inches long with a 0.3 inch wide nail and 0.2 inch wide screw. Both sounding rods are made from a silky silicone so they are flexible and soft. They are hypoallergenic and very easy to clean.