Ahead Armor AR5013 Standard Tom Case, 13 x 9-Inch Ahead Armor Cases begin with their unique shape. Featuring Revolutions patented TruForm design, the shape of each case corresponds to the true shape of the drum plus its mounting hardware. The universal teardrop design allows for a much snugger drum fit. the patented DynaZip zipping system makes it easier to take the drums in and out of the cases The drum-hugging DX-Core provides the security of two layers of high-impact foam paddingplus the softness of premium-grade Sherpa Fleece lining.