Look at the tape measure, and how it relates to the cord. The pictures are enlarged.

http://www.windowblindservice.com/images/0.9mmblindcord.jpg
          0.9mm      

http://www.windowblindservice.com/images/1.2mmblindcord.jpg
          1.2mm      

http://www.windowblindservice.com/images/1.4mmblindcord.jpg
          1.4mm      

http://www.windowblindservice.com/images/1.8mmblindcord.jpg
          1.8mm      

http://www.windowblindservice.com/images/2.0mmblindcord.jpg
        2.0mm      

http://www.windowblindservice.com/images/2.8mmblindcord.jpg
          2.8mm      

http://www.windowblindservice.com/images/3.1mmblindcord.jpg
          3.1m      

Back to cords   http://www.windowblindservice.com/blindcords.html

Picture of the cord color can vary, do to different color settings.

0.9mm is about the size of  the edge on a dime.                    1.2mm is the size of the edge on a  dime.             1.4mm is the size of the edge on a penny

1.8mm is the size of the edge on a nickel                               2.0mm is the size of the edge on two dimes         2.8mm is the size of  the edge on two pennies

3.4mm is the size of the edge of two quarters        These are just approximate sizes to help you place your order.                                            

Cord loop measurements are taken from top of the loop, to the bottom of the loop.