These barrel weights come in 2 sizes, 115 and 175 grams (approx. 4 & 6 oz.)
The finish matches the finish of the gun.
The weight is attached to the lower shroud by two screws from the inside. If you look at the lower shroud, you will see it is only about 40 thousandths of an inch thick. Because of this, it is a touchy job to countersink the holes for the two flat head screws and clear the bottom part of the slide which moves inside the lower shroud. Because of this, I sell the weight installed on your shroud (you send me your shroud, Priority Mail has a small box that they provide and it works great!) for $39.95 plus $6.00 for shipping and handling.  I will ship your shroud with the weight installed 2 to 3 days after I receive it.