OSTER PLASTIC BLENDER JAR OSTER AND OS-030

5-cup square top blender jar fits all Oster blender models using a 5-cup jar and all Oster Kitchen Center models. Interior of the top of jar measures 4" x 4". No. OS-045R: Material: Glass, Capacity: 5 cup No. OS-030: Material: Plastic, Capacity: 5 cup