Pellets are regurgitated masses of undigested food and fur that are produced by birds of prey. They are typically composed of the bones, fur, and feathers of the prey that the bird has eaten. In some cases, pellets may also contain other indigestible materials, such as insects, snails, or vegetable matter.
However, it is very unlikely that you would find a pellet with no bones. This is because the bones of the prey are typically the most indigestible part of the meal, and they are therefore the most likely to be retained in the pellet. In addition, the bones provide structural support for the pellet, and without them, the pellet would likely be too soft and fragile to hold together.
Therefore, if you find a pellet with no bones, it is likely that it is not actually a pellet, but rather some other type of object.