Pre-Moulded Earplug : An earplug that is inserted into the ear canal without the need for prior shaping. They are made from a number of materials and are often available in a range of sizes
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}