Polyurethane, categorized as a polymer, is a resilient, flexible and durable manufactured material that can take the place of paint, cotton, rubber, metal or wood in thousands of applications across virtually all fields. It may be hard like fiberglass, squishy upholstery foam that may be protective like varnish, bouncy like rubber, or sticky like glue. Relating to our cones, this material allows for maximum flexibility that produces great sounding speakers lasting a very long time.

Butyl Rubber is a synthetic (man-made) rubber and is valued for its chemical inertness, impermeability to air, and ability to endure or resist exposure to the many types of weather fronts. Butyl rubber has applications from sports equipment to automotive parts, the medical industry, and more. We use them for the surrounds that connect the cone to the basket. Food-grade butyl rubber is used in many chewing gums as the central gum base, which contributes not only the its elasticity but an obstinate, sticky quality. In a similar way, the butyl rubber surround in our speakers can take an equivalent amount of abuse without quitting.