Material: Usually 100% food-grade 304 or 201 stainless steel, making them BPA-free and toxin-free.Configurations: Available in different compartment counts, including 4-in-1, 5-in-1, and 6-in-1 layouts.Approximate Dimensions: Standard rectangle sizes are often around 34.5 x 25.5 x 2.5 cm (roughly 13.5 x 10 x 1 inches).Features: Many versions are dishwasher safe, stackable for easy storage, and feature rounded edges for safety.