Dear buyer,  Many thanks for your selecting Ruiquan Hardware. About the trial order qty, we have no special request, you can select 100PCS, 200PCS, 300PCS. According to your real situation, you can send your order to us, we will try our best to offer sevice for you. We offer the different style heat sinks, contains:aluminum extrusion heat sink, cold forging heat sink, aluminum housing,CNC products,ect. If you have any aluminum projects, you can send your inquiry to my e-mail box:rq4@dgruiquan.com. Welcome to visit our factory in your free time.