Amazon.com: Shure BETA 57A Instrument Microphone - Supercardioid Dynamic Mic for Vocal and Instrumental Applications with High Output Neodymium Element, Durable Steel Mesh Grille and Shock Mount : Musical Instruments
Shure SM57 - Wikipedia
Shure SM57 vs. Beta57a – MusicPlayers.com
BETA 57A - Dynamic Instrument Microphone - Shure Asia Pacific