Made in the USA - Since 1903, Marine Grade Polymer (MGP) collections are made of High Density Polyethylene a durable material that will not swell, rot, splinter, warp, fade or chemically break down when exposed to humidity, water or sunlight. The material is 100% recyclable as well as environmentally friendly. Care & Maintenance: Avoid teak oil and other products that can stain the finish. Avoid heat sources that exceed 180 degrees F. Only routine cleaning with common detergents is required. Nylon scrub pads and brushes should be used with care because excessive force can mar the finish. For resistant stains, apply bleach and allow it to soak in. Use citrus cleaner, alcohol or mineral spirits to remove grease or oil stains. Automotive silicone spray products or household furniture polish can help to hide scratches in the surface.