Products have tangible and intangible characteristics that define them to companies, markets, and consumers. Marketers classify products based on their durability and tangibility as nondurable goods, durable goods, or services. Marketers also classify consumer goods as convenience goods, shopping goods, specialty goods, or unsought goods based on how often they are purchased and the level of consumer effort in the purchase decision. Industrial goods are classified as raw materials, manufactured materials and parts, capital items, or supplies and business services.