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 difference between custom ear plugs and foam ear plugs? 30-day Money Back Guarantee Returns Ultimate Ears Pro In-ear Monitors What is the UE Pro Sound Guard? How does Ultimate Ears Pro ship? How long is the typical turnaround time from order to shipment for UE Pro Custom In-Ear Monitors?