Some of these are hand sculpted, others are cast off of real bull horns.
Sold in a set of 2, so the price you pay is for a full set.
These come ready to be mounted on a head by either drilling holes in the bottom and sewing, or gluing them down directly, or any of the other commonly used methods of horn attachment. (Strong magnets, screws/bolts/etc)
Each set can very on weight since they are hand slushed, but most sets will be about the same. While these are very durable, if enough pressure is applied they can break. Heat can also cause warping.
For replica horns: These weigh only a few ounces; much lighter than the real thing! However since they are made from natural horns, there can be differences in size/symmetry/details.