These RV wheel simulators also known as Wheel Rim Covers or Skins, fit most RV chassis 16 inch wheels such as the 1974-2010 FORD, CHEVY, GMC, DODGE CHASSIS such as Southwind, Sunseeker, Tioga, Holliday Rambler. They have a spring steel ring reinforced retaining clip system to hold them on. They are made from impact resistant auto grade triple Chrome plated surfaced ABS Plastic.