LOOP Engage 2, high-fidelity earplugs with a comfortable fit. I purchased these and used them for only 6 hours, but they didn't suit my work environment, so I'm selling them. I only used the default M-size ear tips; the other sizes are unused. I can ship on weekends only, but I might be able to ship on weekdays depending on my work schedule, although I'm not sure when. Please feel free to ask any questions in the comments. LOOP Earplugs Work efficiency