What is the R.A.P.S?

So me and buddies are arguing over this for the dumbest of all reasons, but I thought I'd come here and ask y'all for input. Is the RAPS a wheel or a ball? My buddy and I say it's wheel with explosive casing, but my boyfriend says it's a ball... What's y'alls input on this?

So me and buddies are arguing over this for the dumbest of all reasons, but I thought I'd come here and ask y'all for input. Is the RAPS a wheel or a ball? My buddy and I say it's wheel with explosive casing, but my boyfriend says it's a ball... What's y'alls input on this?