They are approx 15 mm deep.
B&P Lamp Supply B&P Lamp 1 5/8" X 10" Clear Hurricane Shade
8 X LARGE CLEAR CASTOR CUPS Carpet/Floor Chair/Sofa Furniture Protectors Caster
4 x Small CLEAR Castor Cups Carpet Floor Chair Sofa Furniture Protectors Caster
4 x small clear rubber castor cups carpet/floor chair/sofa furniture protectors
