I am in the process of building my own electronic drum kit, These pickups work absolutely fantastic and work almost as good as the Pintech and other makes...
For £2.31 per pickup it is much cheaper and effortless than buying a piezo and soldering a jack onto it... Saving the hassle and money!
Drum Module - Roland TD-3
Link To Pickup/Triggers - (£2.315 each) http://www.ebay.co.uk/itm/351045581188?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649