Pack Of 5 Prewired 35Mm Piezo Discs From Goedrum With Double-Sided Adhesive Foam Product Details 1. 5pcs of prewired 35mm wide brass piezoelectric discs. These are perfect for using as touch-sensors, electronic drum triggers, buzzers, or making your own contact mics. Center disc measures approx. 24.8mm wide. Profile is approx. 0.58mm thick. 2. Piezo-element Specification: Type:External drive type element Resonant Frequency:2.9 0.5 KHz Resonant Impedance:300? max Capacitance:30000pF 30% at 100Hz Input Voltage:30Vp-p max Operating Temperature:-20 to +60C Storage Temperature:-20 to +70C Base Material:Brass For DIY Electronic Drums Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.