Here is the basic understandings of autism in new york times website http://health.nytimes.com/health/guides/disease/autism/overview.html
There are several products focused on developmental of motor skills, language & communication, social skills, and emotional regulation.
Most of the toys are made with plastics because it's cheap and light-weighted and only has one features among fine motor skills, emtional regulation, language & communication, social skills, thinking & reasoning, and planning & sequencing but not really designed for toys for children with autism
The idea of how use of plastics are not good for the health. http://www.newsobserver.com/news/story/1011123.htm
By having toys for children with autism, it will be helpful to the family whom have a child with autism and the child his/herself.
autism toys in the market: http://kidscopetoys.com/