Honeywell : 1006186 - 303L Foam plug Dispenser Refill – 200 Pairs. Feature : Polyurethane Foam , Soft foam delivers superior long-wearing comfort and solid performance. Smooth , Soil – Resistant Skin Prevents dirt or other substances from accumulating on skin or Entering ear canal. Benefit : The Bilsom 303 L earplugs are ideal for workers who need to block out loud noise demand the best protection and comfort available in an earplug. Europe most-used polyurethane earplug, the 300 series earplug, offers superior noise-blocking performance in a single-use earplug.