The binding rails for EP Bind books differ in colour, material, length and width. The rails are generally available in lengths of 304 mm (portrait format EP Bind) and 217 mm (landscape or square format EP Bind). The spine width of the rails determines the number of sheets in the EP Bind. Here is a brief overview (calculated using 160 g/m² paper):

 

Spine width in mm	5	7	10	13	16	20
Number of sheets	18	26	46	66	82	98