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 How long is the typical turnaround time from order to shipment for UE Pro Custom In-Ear Monitors? What is the UE Pro Sound Guard? Are more drivers better?