I agree with Jimbo, and generally turn my nose up at jelly toys. There is no standardized list of ingredients, so the manufacturers can basically put whatever material they like into their products and we would be none the wiser. Since sex toys aren't regulated, this is also a legal practice provided that the manufacturers label their products as "for novelty use only".
Jelly toys are impossible to sterilize since the material is very porous. They also contain phthalates, chemicals that are used to soften the plastic and give it that squishy texture. Before buying any jelly toys, I would advise anyone who is unfamiliar with these chemicals to Google "phthalates and sex toys" in order to be an informed consumer and make your decision based on that.