Howard Leight Ls400 Bulk Refill. Leight earplugs offer the highest degree of protection against hazardous noise ideal for use in environments with loud explosions blasts or weapon discharges. Leight Earplugs offer the highest degree of protection against hazardous noise ideal for use in situations where hearing protection is a necessity whether on the job or at the shooting range. Leight Hearing Protection offers the greatest degree of protection for your valuable hearing. Specifications for Howard Leight Ls400 Bulk Refill: Manufacturer: Howard Leight NRR: 33 dB Quantity: 200 pair Size: One Size Color: Orange Package Contents: Howard Leight Ls400 Bulk Refill Howard Leight MAX-LS4-REFILL: Ls400 Bulk Refill