What are the different levels of noise protection for custom-made ear plugs? Follow We offer -9db, -15db and -25db sound isolation levels. Related articles What is the UE Pro Sound Guard? What is the difference between custom ear plugs and foam ear plugs? How does Ultimate Ears Pro ship? How long is the typical turnaround time from order to shipment for UE Pro Custom In-Ear Monitors? How do I use wireless transmitters with my UE Custom In-Ear Monitors?