Maxlite LS500 Dispenser RefillCode: 670429000 Smaller Diameter Ideal for workers with smaller ear canals, including women. Low pressure Polyurethane Foam Expands gently for comfortable long term wear, eliminates feeling of ldquo; tightnessrdquo; in ear canal. Contoured T Shape Aids in easy insertion, removal from ear canal. Box of 500 Ideal for workers with smaller ear canals, Max Lites low pressure foam expands gently inside the ear canal for comfortable long term wear,