MKM Decorating Disks 

4 Inch: DD-04 are a super useful set of 4 inch (10 cm) disks designed to allow users to divide space easily and quickly. They come in a set of two (odd and even) sturdy flexible transparent sheets.

15 inch: MKM Decorating Disks DD-15 are a super useful set of 15 inch (38 cm) disks designed to allow users to divide space easily and quickly. They come in a set of two (odd divisions and even divisions) sturdy flexible transparent sheets.  They can be used to evenly space handles,  to initiate brushwork, to create multi sided plates, mark throwing bats, and so on.