Just wanted to state my appreciation on the the utterly complete hardware package that is included with these Tactic servos. Many arm sizes and spline choices to get it done right. Oh and LOVE the tray to hold everything from getting lost. These are mini coreless digitals for a couple dollars more than the analogs and they are quicker, stronger and lighter with twice the resolution. Only drawback, no replacement gear sets available. Oh well , cheap enough to just replace when needed. I've never used anything but Futaba servos until I came across these.