Cheap And Discounts 2/4/6/8/12/18 Channel Micro Rotate Slip Ring 2A Diameter 12.5mm for RC Excavator Model DIY PTZ Gimbal Electric Collector Rings Wholesale. Buy Directly From Merchant YH Hobby Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.