Aluminum and open-cell frame help cassettes not to deform.
Nitrogen gas returns cassette to original state.
Available in a wide range of sizes and colors: 8" x 10" 400 green; 10" x 12" 400 green; 11" x 14" 400 green; 14" x 17" 400 green; 8" x 10" 800 blue; 10" x 12" 800 blue; 14" x 17" 800 blue; 14" x 36" 800 blue; 24" x 30" 800 blue; 7" x 17" 800 blue high speed; 7" x 17" hospital; 10" x 12" hospital; 11" x 14" hospital; 24" x 30" hospital; 8" x 10" alum; 14" x 17" alum.