Ok, we are looking at female - female jumper leads.
But there are three things you have:
1 - The length. Only shown for two of the three. (Blue)
2 - Some weird numbers in the red circled area. (Red)
3 - The quantity you get. Only shown on the last one: 40. (Green)
No worries! These should be easy questions to answer
We get jumpers from a variety of manufacturers, and some stick the length in the description, others in the name. That’s likely where the difference comes from
Those numbers are actually 20 x 6" (inches), but product names can’t contain quote marks, so that gets lost in the wash
Quantity is that first number in the last point, i.e. 20 x 6 is twenty pieces of six inch jumpers