Howard Leight by Honeywell Leight Source 500 Max Lite earplugs Dispenser Refill saves time and space and the plugs are made of polyurethane foam which can be expanded for a comfortable long term wear. The contoured shape of the plug facilitates easy handling and is perfect for those having smaller ear canals. Earplugs feature a soil resistant closed cell foam skin that avoids dirt build up and are used in automotive industry, aviation, forestry, furniture manufacturing, landscaping and more.