Store › Fun Friday One Class (Ages 12-21) 11/13 Image 1 of 1 Fun Friday One Class (Ages 12-21) 11/13 $30.00 Learn how to make a tray out of a slab of clay for jewelry or keys! Ages 14-21. Tools, clay, glazing and firing included. Add To Cart Added! Learn how to make a tray out of a slab of clay for jewelry or keys! Ages 14-21. Tools, clay, glazing and firing included.