Sea Stone Napkin Ring in Navy Set of 4 by Kim Seybert. These napkin rings are like the tumbled stones you happen upon on a beach walk. Tonal shades of resin stones - white and cobalt - are arranged in clusters to create a random found effect. They are mounted on a beaded ring for an extra wow factor. Materials: 65% Acrylic Beads. 25% Metal Base. 10% Glass Beads