Black Bam Classic Violin and Viola Double Case Designed for a 4/4 violin and a 16" 3/8 viola The Bam classic double violin and viola case is a great option for protecting two valuable instruments. The case features Bam's patented foam core protection. Which serves as a suspension system for both instruments. The foam core is also great against thermals shocks, such as hot and humid weather, or sudden changes in external temperature. The exterior fabric is water-resistant. And all the hardware on this case, such as zippers, buckles, etc., are made of quality materials. With a name like Bam, you know you'll be getting a durable case that will protect your instruments for decades to come!