Smith marine-grade carpet is manufactured from high-quality, 100% PET polyester and includes a durable backing for long-lasting use. The weather-resistant carpet with minimal water retention features 16.1-oz. yard weight per square yard. Carpet pile height is 5/32". 18" wide carpet will cover a 3 x 8 or 4 x 8 board. 18'L x 18"W. Weather-resistant fabric resists UV damage Durable backing for long-lasting use | Black Marine-Grade Carpet Roll, 18'L x 18"W