Stainless Steel is a good alternative to titanium. These frames have low toxicity, are lightweight, and are very strong. Most frames made from stainless steel are hypoallergenic and nickel-free.
The most significant benefit of stainless steel eyeglass frames is that they are readily available and affordable. And because stainless steel frames are usually mixed with chromium, they are also resistant to heat, corrosion, and abrasion.