Bevels are small, granite markers which are cut with a slight slope from back to front. They normally have about two inches of drop, as in eight inches in the back and six inches in the front, and come in just about any length or width. The advantages to this style is that they are still less costly because there is less granite and, because they sit above the ground, it is easier to find them in the fall and winter.
There are two disadvantages. The first is that bevel markers still have a fairly flat surface and water and dirt tend to sit on them. The second is that if mowing equipment bumps into them there is a good chance they will get damaged because the edges are exposed.