OG Spherical Rectangle 5"x12"The OG Spherical Rectangle 5x12" Form is the ideal size for trinket dishes, small serving trays, and more. The OG Spherical Rectangle 5x12" is also stackable with our OG Spherical Rectangle 6. 5x13. 5" Form, which allows for greater depth and versatility. Clay should be left on the OG Forms until stiff, leather hard. Each OG Form has a 45 degree angle edge, and 3 4" depth. All Forms are measured in inches. Weight: 0. 89 lbs.