As the casting process was refined and newer plastics were introduced the details that could be cast in plastic improved. Plastic models started to become much more common, being produced to high levels of details and sold as equivalent quality or superior quality premium product compared to metal. Many companies now produce all or the majority of their models in high quality plastics, often polystyrene. With the increase in production of plastic models the models produced could be made increasingly larger and with more details. Whilst hand sculpting a master to then cast a mold is still a common practice, it is becoming increasingly common for models to be digitally sculpted and a master 3D printed to then cast the molds from. This has greatly increased the quality of details that can be sculpted, as finer details can be included. For these higher levels of detail, plastic models have become more popular for higher standards of painting, as well as plastic models being less susceptible to flashing or casting imperfections and requiring less preparations before painting. Plastic models also allow for more options in the pose of the models as they are often sold on the sprue in pieces to be assembled, rather than a single piece of cast material. This allows for the kit to include multiple parts, as plastic is significantly cheaper than metal, that can fit together to allow multiple different variations of the model to be built, for example a kit might provide multiple different weapon options.