3,Layering flower die cut set . Thin metal in carbon steel. for shrink plastic 
 
Size range - 3 1/8 " - 1".  Will shrink to half their size.
 
Tips for Successful Cutting
To achieve clean, consistent cuts when working with shrink plastic, consider these best practices:
The Sandwich: Since these are thin metal dies, you generally need to use the manufacturer-recommended platform system for "wafer-thin" or "thin" dies. 
Multiple Passes: Because shrink plastic can be denser or have a different texture than paper, running the die through your machine twice (forward and backward) ensures the die fully penetrates the material.
Intricate Details: If your design is very detailed, running the die through at a slight angle or placing it toward the edge of the cutting plates can sometimes provide a cleaner cut.
Alignment: When layering, if you are using multiple dies at once, use a small piece of low-tack painter's tape or washi tape to secure the dies to the shrink plastic before running them through the machine to prevent them from shifting. 
Here is a link to successfully using the die cuts in a Sizzix machine.
https://www.youtube.com/watch?v=isof6di9peI&t=11s