I believe Walter Ray had a USBC Viz-A-Ball in his hands, while Barnes and Tommy etc, were throwing Urethane Hammers. The past few years internationally, Urethane balls have looked really really good on the short, as they control downlane direction change really well. Unfortunately, they are awful hard to find, since they haven't been made in about 15 years now, so I'm sure Ebonite International, has made some sort of accommodations to allow Chris, Tommy, etc. to put the proper balls in their hands as they represent our country.