LR Baggs LRBIBAS-C iBeam Bridge Plate Active Pickup System for Nylon String GuitariBeam Bridge Plate Pickup With "Mic like" Fidelity The iBeams MIPA award winning design employs a matched pair of virtually weightless film sensors that flex With the soundboard to trace your guitars voice much like diaphragms in a stereo mic. A key advantage over typical bridge plate sensors is the iBeams cardioid like response pattern that inhibits feedback and string squeak while selectively admitting rich tone producting vibrations. Weighing less