LASER LITE HI-VIS COLORS: Vibrant yellow & magenta color is highly visible from a distance to help ensure employee compliance and hearing safety; it also helps prevent loss or misplacement EXCELLENT NOISE REDUCTION (NRR 32): Self-Adjusting foam earplugs expand in the ear upon insertion to create a secure seal for excellent hearing protection in loud workplaces and jobsites IDEAL FOR SMALLER & LARGER EARS: Small size of earplug delivers optimal fit and ear protection for smaller ears, but low pressure foam expands to fit virtually any size ear and ear canal COMFORT & HYGIENE: Contoured T-shape allows for easy insertion and removal; Smooth, soil-resistant, closed-cell foam skin helps prevent dirt build-up LEIGHT SOURCE 500 DISPENSER REFILL: 500-pair refill box for use with the Leight Source 500 Earplug Dispenser (LS-500)