Review on YIYITOOLS Non-Slip Hammer - YY 7 001 by Marc Zitnik

If there's something about this hammer that makes it a failsafe demolition hammer, it's just too much of it to not move at all in the hammer head. It does not absorb rebound or vibration. This appears to be normal for a standard ball joint. I recommend something better if you want something that's actually a dead slap hammer.