These polypropylene containers are carefully engineered for the storage of histology specimens. Features a molded O-Ring" polyethylene screw cap that forms a seal that eliminates most formalin leakage and evaporation. Convenient graduated container. Straight sided for more stable and leak resistant than slope-side containers. Space saving in storage areas. The durable polypropylene container is translucent, flexible, resists cracking and splitting, and eliminates the problems associated with formalin evaporation.