These felts aren´t very expensive, they fit better for 8mm cymbal stands, I write this because it´s not written on this page. If you use them with a 6mm cymbal stand, they move a little bit, but if you want them to move, chose them, no problem, there is a great value for money.
With the quality I have 2 Problems, because of this just 3 stars:
1.One of the 4 is not straight up, so he sits not perfectly under or over the cymbal.
2.since these felts are made of small threads, some of them go away, while I play and this looks not great on top of my briallant cymbals.
Thickness is a half inch (1,27cm)
At the end I want to say that this product is great to avoid shippingcosts, because of his low price and because every Drummer should have it in his emergency-box.