I'm currently playing the Penta TP3. Bought quite a few last year on sale - buy 2 dozen and get a 3rd dozen free. Pretty good deal on what I think it a very good golf ball 3 piece ball with urethane cover. Good all around ball for both distance and short game.
I'm pretty sure it's 4. I can remember taking 3 penalty strokes quite a few times, but I do recall one round where I dunked a few in a row but I don't recall exactly how many it added up to. Hell, maybe 5.
I have 2 at the moment, a SC Newport 2 that I've had for 3 years and a TM Spider counter balanced, a mid sized mallet that I just put in the bag a couple months ago. I've been through a lot of different putters over the last few years.