Replacement brake pads for your Wilwood NDL or Dynalite calipers (or comparable Ultra Lite calipers). Width 4.00" High friction throughout temperature range, High temperature range. Formulation specific for use with Polymetalic coated rotors. Pads will fit: Wilwood Billet NDL calipers. Wilwood Forged NDL calipers. Wilwood Dynalite calipers w/ Bridge Bolt. Ultra Lite UL-237. Tech Tip: Only use full metallic pads on ceramic coated rotors. Learn how to properly Bed-In your brake pads by reading our tech article.Bedding-In Brake Pad Procedure.