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2 x QINLON Smaller extra Thin New Speaker 0.5W, 50 Ohm (size 36mm Dia x 16mm) | eBay
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K 16 50Ohm Visaton | Visaton 50Ω 0.5W Miniature Speaker 16mm Dia. , 24mm Lead Length, 16 (Dia.) x 3.5mm | 716-6453 | RS Components