Radar Scanner Belt Tensioners: Size - 50-100 mm width, Grade - Industrial Grade, Viscosity - N/A, Buoyancy - N/A, Material - Polyurethane or Rubber.
Navigation Systems: Size - Varies by model (typically 200-400 mm diameter), Grade - Marine/Aerospace Grade, Viscosity - N/A, Buoyancy - Waterproof/floating options available, Material - Aluminum, Stainless Steel, or Composite.