CyberTech By Noosy [2nd Generation] Micro SIM Cutter (Color: Black or Silver), with 2 SIM adapters
Professionally cut your regular sized SIM card to a micro SIM. Use the micro SIM in your iPhone 4 or iPad.  This is 2nd generation sim cutter from Noosy.  More reliable and reduce chance of failure.  You can reuse the micro SIM in your old devices with the included macro SIM adapters.