The Professional Trowel has a 4 1/2" wide x 11-1/2" long high carbon bright spring steel blade for maximum life. The FCA-FFA and FFA-FCA is a four-side notch combination. For the FCA-FFA and FFA-FCA trowels, the first listed notch is for usual right hand use.  The FCA and FFA Notches have a 10º angled leading edge.