Tuffak® SK1 (Makrolon® SK1)

Nhựa chuyên nghiệp cung cấp tấm nhựa, thanh, ống, màng và các bộ phận chế tạo cho tất cả các khu vực tàu điện ngầm lớn ở Hoa Kỳ, bao gồm: Albuquerque, Atlanta, Austin, Bakersfield, Baltimore, Birmingham, Boise, Boston, Buffalo, Charlotte, Chicago, Cincinnati, Cleveland, Colorado Springs, Columbus, Dallas, Denver, Des Moines, Detroit, El Paso, Fort Worth, Fresno, Hartford, Houston, Indianapolis, Jacksonville, Kansas City, Los Angeles, Las Vegas, Long Beach, Louisville, Memphis, Mesa, Miami, Milwaukee, Minneapolis, Nashville, Newark, New Orleans, New York, Oakland, Oklahoma City, Omaha, Orlando, Philadelphia, Phoenix, Pittsburgh, Portland, Providence, Raleigh, Richmond, Riverside, Rochester NY, Rockford IL, Sacramento, Salt Lake City, San Antonio, San Diego, San Francisco, San Jose, Seattle, St. Louis, Tallahassee, Tampa, Tucson, Tulsa, Virginia Beach, Washington DC, and Wichita.

Các thành phố khác được phục vụ bởi Nhựa chuyên nghiệp bao gồm: Abilene, Akron, Alexandria, Allentown, Amarillo, Anaheim, Anchorage, Ann Arbor, Arlington, Arvada, Athens, Augusta, Aurora, Baton Rouge, Bellevue, Berkeley, Billings, Bridgeport, Brownsville, Cambridge, Cape Coral, Carrollton, Cary, Cedar Rapids, Chandler, Charleston, Chattanooga, Chesapeake, Chula Vista, Clarksville, Clovis, College Station, Columbia, Columbia, Concord, Coral Springs, Corona, Corpus Christi, Dayton, Denton, Durham, Elizabeth, Elk Grove, Escondido, Eugene, Fairfield, Fargo, Fayetteville, Fontana, Fort Collins, Fort Lauderdale, Fort Wayne, Fremont, Frisco, Gainesville, Garden Grove, Garland, Gilbert, Glendale, Glendale, Grand Prairie, Grand Rapids, Greensboro, Hampton, Hayward, Henderson, Hialeah, Hollywood, Honolulu, Huntington Beach, Huntsville, Independence, Irvine, Irving, Jackson, Jersey City, Joliet, Kent, Killeen, Knoxville, Lafayette, Lakeland, Lakewood, Lakewood, Lancaster, Laredo, Lewisville, Lexington, Lincoln, Little Rock, Lubbock, Macon, Madison, McAllen, McKinney, Meridian, Mesquite, Midland, Miramar, Mobile, Modesto, Montgomery, Moreno Valley, Murfreesboro, Naperville, New Haven, Newport News, Norfolk, Norman, Oceanside, Olathe, Ontario, Orange, Overland Park, Oxnard, Palm Bay, Palmdale, Pasadena, Pasadena, Paterson, Pearland, Pembroke Pines, Peoria, Plano, Pomona, Port St. Lucie, Rancho Cucamonga, Reno, Richardson, Rochester, Roseville, Round Rock, Saint Paul, Salem, Salinas, San Bernardino, Santa Ana, Santa Clara, Santa Clarita, Santa Rosa, Savannah, Scottsdale, Shreveport, Simi Valley, Sioux Falls, Spokane, Springfield, Springfield, St. Petersburg, Stamford, Sterling Heights, Stockton, Sunnyvale, Surprise, Syracuse, Tacoma, Tempe, Thornton, Thousand Oaks, Toledo, Topeka, Torrance, Vallejo, Vancouver, Victorville, Visalia, Waco, Warren, West Palm Beach, West Valley City, Wilmington, Winston-Salem, Worcester, and Yonkers.