Cheap And Discounts 10Pcs 12mm 15mm 18mm 20mm 23mm 27mm 35mm 50mm Piezoelectric Piezo Ceramic Wafer Copper Plate Buzzer Loudspeaker for DIY Wholesale. Buy Directly From Merchant Handysun Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.