What is the nimbostratus made out of?

Nimbostratus clouds are primarily composed of water droplets and, in colder conditions, ice crystals. They form in stable atmospheric conditions and are characterized by their thick, gray appearance, which often covers the sky completely. These clouds are associated with continuous, steady precipitation, such as rain or snow. The uniformity of nimbostratus clouds is due to the extensive layer of moisture that they contain, leading to overcast skies.