Smr stamps are 1 cm (0.4 inch) in diameter. MKM stamps are beautifully carved, have unique designs, and release well from clay or any soft medium. MKM stamps are made from wood that is precision carved to make deep beautiful impressions. The stamps are also bevel carved, allowing them to release easily from clay. The Smr stamps are finished with tung oil to ensure durability over many years of use. These stamps are easily cleaned with water and a soft toothbrush.