Rapid EBI0108 Coplin Jar allows for complete submersion of slides for staining. It has 4 grooves within the jar to separate each slide. Each groove allows for 2 slides to be placed back to back. The jar has a threaded screw top. Coplin jar measures approx. 4.50" tall , 2.36" top and bottom diameter. Made of Polypropylene. Autoclavable.