Heavy Duty Design 3/8" Mud Flaps. Great Lakes Mud Flaps high quality constructed truck splash guards are molded from tire cord-reinforced solid rubber to stand up to the most severe road conditions and to resist cold weather cracking and tearing. Great Lakes rubber splash guards and wheel chocks are made with Symarr which is an extremely durable fully-cured, fiber-reinforced rubber product made from recycled rubber. Symarr is known for superior durability, performance, versatility, and economy. Our splash guards are molded using a unique grain pattern process eliminating the "waving" effect. Slotted holes on standard centers allow quick installation. You no longer have to worry about variable tolerances when mounting our flaps to various trailer bodies. Enhance your vehicles's appearance, meet NTSB safety requirements and enjoy these additional "Great Lakes Advantages".