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Peek Film Brown 4 Mic-500 Mic in Thickness with High Heat Resistance for Electrical Insulation Aerospace Insulation Acoustic Speaker Diaphragms, Find Details and Price about Polyetheretherketone Film Yellowish Brown / Brown from Peek Film Brown 4 Mic-500 Mic in Thickness with High Heat Resistance for Electrical Insulation Aerospace Insulation Acoustic Speaker Diaphragms - Dongguan Keraf Electronic Technology Co., Ltd.