Wire baskets are typically made of lightweight metal. But it is believed that certain acidic fruits can react with the metal, especially with aluminum and tin. Stainless steel might be a better choice because it is the least reactive of all metals.
If you are concerned about the metal leeching toxic chemicals into your fruit, you can opt for wicker. It’s a natural product and a completely safe one at that. As a plus, wicker is an aesthetically pleasing material that’s available in a variety of colors too.
Ensure that you pick a material that can be cleaned easily as well.