An important element in determining the quality of gelatine is the firmness or strength of the set gel. This is characterized by the "Bloom" value. The higher the Bloom number, the stiffer the gelatine and, in general, the more expensive it will be. 

McKenzie’s Gelatine Powder and McKenzie's Gelatine Leaves are both PLATINUM STRENGTH.  Gelatine Powder has a bloom strength of 210-230 and McKenzie's Gelatine Leaves has a bloom strength of 220-260.