Fontanelles are usually made of wood in most instances. They are used to protect the keys and mechanisms on wind instruments.

The fontanelles.

They are called fontanelles.

FONTANELLES

The cast of Hobgoblins - 1988 includes: Ken Abraham as Thug Tom Bartlett as Kevin Steven Boggs as Kyle Tony Cisero as Fontanelles--Drums Tamara Clatterbuck as Fantazia Cole Coonce as Fontanelles--Guitar Jeffrey Culver as McCreedy Patrick Dean Bostrom as Fontanelles--Guitar Billy Frank as Nick Kari French as Pixie Mark Hodson as Fontanelles--Bass Kevin Kildow as Dennis James Mayberry as Sergeant Parker Daran Norris as Club Scum M.C Kelley Palmer as Daphne Spit Spingola as Fontanelles--Vocal Paige Sullivan as Amy David Teague as Lowlife Duane Whitaker as Roadrash