itz's are just dials that are placed into base shells. they have 4 or 8 prongs per dial, and give lateral movement, diagonal movement, etc... with the prongs being hidden under the shell, it is difficult for the defense to tell which way you are going. i have achieved both strength and speed out of these. you can get them through mark klingbeil, mklingbeil on this forum. do a search for the dials, he gives an e-mail address to contact him, but i do not remember it.
tornado alley f-5's can achieve good strength and speed combos, imo. i have them on a number of my league players. get them here
http://www.tornadoalleyefs.com/main....B.qscstrfrnt01
tweaking is a must with these, and heating your pliers helps tremendously. they come with a brochure that contains tweaking tips.