This is a vintage three-piece set of stoneware cereal bowls from the late 20th century by Otagiri. The bowls have a round shape and a mid-century modern style, featuring a pattern in red, black, gray, and brown colors. Each bowl is 5 inches in diameter and can be used for serving cereal, chili, soup, or other dishes. The production technique used is pottery, and the product line is called "Horizons."