Hello, I'm currently evaluating and researching single use valve technologies for microfluidic MEMS devices. The valve should normally be closed and have a 1 time open function. Dimensions should be around 0.5mm*0.5mm, but are flexible. Please feel free to post a reply or e-mail me. Thanks. -- Shawn O'Rourke email: sorourke@macconnect.com AOL Instant Messanger: eirethug2