About this item Maximum compatible headphones dimensions (case inside): 5.71 x 5.31 x 3.35 inches. Compatible with many wired and wireless headphones. Engineered ultra-hard shell protects against drops, impacts, or crushes. Soft inner lining maximizes headphone protection in the case. A good replacement or upgrade for original headphone cases. Dimensions: 5.71 x 5.31 x 3.35 inches.