Metal, continuous thread cap 38-400 finish. Commonly used on glass bottles or jars, and jugs. They can also be used with lotion, soaps, creams, and personal care items. Continuous thread caps are popular in a wide range of wholesale industries from food, personal care, pet care, household products, industrial products, health and beauty, arts, crafts, hobbies and just about any other market segment. Aluminum closures are lightweight and can tolerate various temperatures. They are also resistant to impact fractures. They are applicable with products in high humidity environments, high salt content products, or water.