If being used as a filter without separate cartridge

while the seamless front boosts protection right where it’s needed most

Quickly install it with the two mounting holes

Automatic power off function

specially designed ACME threaded bolt that lets you bust stubborn beads using a 1/2" drive ratchet wrench or pneumatic impact wrench

Honeywell Howard Leight MAXIMUM Earplug Canister Refill | 400 Pairs starter If being used as aHoward Leight's MXM Earplugs are constructed of a soft, polyurethane foam that is long wearing and comfortable. The bell shaped design easily inserts into the ear canal and prevents the accumulation of dirt and other substances. 400 pairs per canister. NRR of 33 dB.