Available in 3 materials.
White Stong and Flexible is the cheapest material. It requires the most work. It is sandy/gritty. It requires a super thin super glue coat. Then sand, putty, primer, paint. Then do that again.
Plastic Acylic is middle of the road. Less work than WSF, but less than Frosted Ultra Detail. Sands, glues, and paints like regular model parts.
Frosted Ultra Detail. Most expensive, but least amount of work. Sands, glues, and paints like regular model parts.