These polymer clay molds are not flexible.

Approximate Measurements are -
 
Size: 22.19 mm =  7/8 inch
 
Thickness: 6.50 mm
 
Sellers Tip: Just dust mold with baby powder or corn starch (optional) add clay then press clay down, gently lift clay up from our molds, place on a cutting mat and trim the areas of the clay. Clay item that comes from our molds may be even enhanced by adding more clay to the finish piece etc.