Product Name : 4mm Omnidirectional Back Electret Size : Dia. 4mm x 1.5mm   Zoom In Product Name : Omnidirectional Back Electret Size : Dia. 6mm x 1.3 ~ 5.0mm   Dia. 9.7mm x 4.5 ~ 6.7mm   Zoom In Product Name : Omnidirectional Front Electret Size : Dia. 6mm x 1.3 ~ 5.0mm   Dia. 9.7mm x 4.5 ~ 6.7mm   Zoom In Product Name : Noise Canceling Back Electret Size : Dia. 6mm x 1.5 ~ 5.0mm   Dia. 9.7mm x 5.0mm   Zoom In Product Name : Unidirectional Back Electret Size : Dia. 6mm x 5.0mm   Dia. 9.7mm x 5.0mm   Zoom In