White nylon plastic polished to reveal a smooth matte finish.
About this Product
Shapeways lists the material as non Toxic, dishwasher safe but not food safe.
WSF is very porous, so if you use it for food I recommend to clean it thoroughly and seal it with a food save varnish like Press Varnish or Kelterlack. Or you can simply wrap them into aluminum foil before to using.