The earplugs with clear cases are made of PU foam,which are safe and comfortable.You just need to squeeze the earplugs and carefully push them into your ears then let go.They can protect you from noise effectively when you are sleeping,working,traveling or reading.Besides they are waterproof so they are suitable for swimming as well.Your logo can be printed on the case. Measuring 1-1/2 inches, this custom foam earplugs in clear case with chain. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: Portable, durable, practical for daily use.