Howard Leight by Honeywell Leight Source 400 Laser-Lite earplugs Dispenser Refill saves time and space and the plugs are made of low pressure polyurethane foam that can be expanded for long term wear. The plugs feature a contoured T-shape that helps in easy handling and the soil-resistant closed cell foam skin avoids dirt build-up. Earplugs are used in automotive industry, aviation, building construction, forestry, furniture manufacturing, landscaping and more.