z06. I have a similar pair of trax for my boots.
My company uses them and recommends Stabilicer Lite™ manufactured by 32north Corporation -
www.32north.com.
I have a pair at work and bought with my own money a pair for home, cause they are that good.
I got them off ebay for cheaper but here they are
http://yhst-38740193578973.stores.yahoo.net/lite1.html