First of all, I'd like to do a review of the the other person's review (Chelorokks). This person is an idiot and it troubles me that they think it is necessary to rate this PRODUCT poorly because of SHIPPING issues. I wanna know how the product works, not read about how you waited at home and cried for 3 weeks.
Anyways, this product shipped fine for me, and it works perfectly. I have no complaints. I bought one, it worked great, so I went ahead and bought 2 more to keep everything in my horn more consistent. The springs seems a bit stronger than the stock springs I originally had.