Hot Racing Extended reservoir for shocks
they're brand new.
and a bit pricey. unless you want to be the guinea pig give it time.
this just looks like a waste of money IMO.. i cant see them improving the performance of your truck at all. to me it looks just like added weight, and waste of money.. i dont see why you would buy those when the stock traxxas, or other options (gpm, etc..) fit just fine right into the truck, and perform well. IMO piggybacks are overrated.
And like core said, give it time or else you will be the one who gets to find out that they are a dud (if they truely are a dud)
Hope this helps!