Cassette holds 20 instruments. Exterior Dimensions 8" x 11" x 1.25" (203 mm x 280 mm x 32 mm) IMS® cassettes are made of long-lasting, low-maintenance stainless steel. Soft, colored silicone rails securely hold instruments throughout the processing cycle. Available in over 100 different sizes, configurations and color options, and can be specialized to meet your needs.