They each come with non-slip coating (green as seen in photo) that allows you to hold the ruler in place easily.  You can create classic quilting patterns such as circles, baptist fans, clamshells, waves, straight lines, arcs, feathers, and more.  

Included:

1. Simple arc and straight line ruler

2. Long Double Arc ruler

3. Clamshell ruler (small wave, clamshell)

4. Circle (both inner and outer can be used for designs)

5. Feather (three sizes  of feathers on one ruler)

These rulers are meant to be used with a ruler foot on a domestic machine. They are not suitable for a long arm machine.  

Digital instructions are included 

You can buy the ruler foot appropriate for your machine here:

 High Shank Ruler Foot 

Low Shank Ruler Foot

the thickness of the ruler is 2.9MM
1 set = 5pcs