Humm Napkin Ring in Blue & Green Set of 4 by Kim Seybert. A whimsical touch for your tropical themed table. the Humm napkin ring in its glorious cornflower blue and leaf shades is just the conversation starter your setting needs. Materials: 40% Styrofoam. 30% Duck Feathers. 10% Goose Feathers. 5% Guineafowl Feathers. 5% Plastic. 5% Polyester. 5% Wood