The Ignition I was built around the Bent Metal Missionary binding, and was the first one we came out with. We've discontinued the Ignition I completes this year and just sold out of our last sets of baseplates only. The Ignition II is built around the Bent Metal Restraint binding. We're selling complete and baseplate only Ignition II's for the rest of this year. For more info check out our site http://www.sparkrandd.com.