If you're looking for toys that are very body-safe, look into things like pure silicone, steel, and glass. Hard plastic is also pretty safe, since it's non-porous and reasonably sturdy (though it often can't be cleaned as thoroughly as the other three).

Other materials have their benefits and drawbacks, so it's just a matter of weighing your options. When browsing Eden, note the "safety rating" included in the product's information along the left-hand side of the page, and think about how low you'd like to go on it (10 is the safest). You can also check the safety features and see if a toy is listed as being phthalates-free, nonporous, and/or hypoallergenic. A tag saying the toy is made of food-grade material is also a good sign.

You can also look at Eden's materials guide, which will give you a better idea of what each material is like.