I use these materials under a set of Detroit Diesel 671 Engines in my 50ft SeaRay. The engines are White and the PigMat cmplements the appearance. I use the Oil Absorbant Roll and Mat uner each engine giving the engine room the look of professionalism while protecting our most presious commodity from oil drops in the bilge discharge water. Bisides being environmentally consious, they give me the exact location of minor engine oil leaks that are easily repared before becoming a real problem. I run a very clean ship and love to show off my engine room. People comment on the PigMats all the time. I buy the product by the roll and keep extra in the engine room for emergencies. Haven't had to use them for that yet and hope I never do! Your Product is the BEST!