Midwest Tungsten Service provides the highest quality refractory metals, W (Tungsten), Mo (Molybdenum) and Ta (Tantalum) since 1958. MTS is a premier, ISO Certified manufacturer that provides fast lead times on custom machined parts and is the industry leader for quality products & service. Have a question? We would love the opportunity to serve you. Give us a call at 1-800-626-0226 or 1-630-325-1001 or email us, mts@tungsten.com.