12 units with universal clip strip. About the Bread Warmer: KEEP BREADS AND BAKED ITEMS WARM: Bread Warmer keeps bread and baked items warm throughout a meal for approximately 45 minutes. For best results, simply heat the ceramic tile in your oven, toaster, or barbecue grill. Set the heated tile in a cloth-lined basket or dish, placing your warmed bread or buns on top, and cover with a cloth. Use to keep bread, rolls, croissants, and folded tortillas warm when serving. Great for family meals! Avoid interrupting meals to warm more rolls.