Rockshox Megneg for 47.5 to 55mm stroke shocks.
Did exactly what it was supposed to do and gave excellent mid stroke support and pop, but unfortunately the suspension design on my bike meant it ramped up too much and couldn’t get near full travel even with no positive spacers.
Only had 6 hours riding on it but not suitable for my weight or bike.
Only thing missing over buying new (£90) is the small sachet of suspension fluid but still some of the grease left.
£45 including UK postage.