Easy, stackable storage Leak-resistant containers offer superior safety and handling Clear, virgin polypropylene provides better view of samples and prevents container from discoloring or becoming brittle Bio-Tite and dual-threaded caps provide a leak-resistant seal for harsh transport conditions and pneumatic tube systems Sterilized by gamma irradiation, which eliminates potential contamination Grips, located at the top and bottom of container, provide easy-grip and handling with or without latex gloves Instructions printed in English and Spanish on the labels Order Info Available with either 48 or 53mm opening.