Polk Audio Ultramarine 8.8" Coaxial Speakers - Silver. 8" Coaxial Speakers brings your music to life on the water These speakers by Polk Audio utilize air suspension technology to deliver a powerful 250 watts of power. The Polk Audio Ultramarine 8.8in Coaxial Speakers have a durable UV/corrosion-resistant finish so they can last a lifetime on your boat. Music lovers have praised the Polk Audio Ultramarine 8.8in Coaxial Speakers for their impressive sound lightweight and forgiving design. If you are a music lover you will be pleased to know that these Polk Audio Ultramarine 8.8in Coaxial Speakers are waterproof and UV/corrosion-resistant making these Polk Audio Ultramarine 8.8in Coaxial Speakers an excellent compliment to any marine environment. Specifications for Polk Audio Ultramarine 8.8" Coaxial Speakers: Manufacturer: Polk Audio Quantity: 2 Water Resistance Level: None Size: 9 in Features of Polk Audio Ultramarine 8.8" Coaxial Speakers Size: 8.8" QTY: Pair Mounting Style: Flush Watts Max: 250 Waterproof: No Weatherproof: Yes Package Contents: Polk Audio Ultramarine 8.8" Coaxial Speakers Polk Audio UMS88SR: Ultramarine 8.8" Coaxial Speakers - Silver