There are two styles of acrylic templates available for this project.
The solid acrylics are perfect for rotary cutting, available with 1/4 inch or 3/8 inch seam allowances.
Windowed acrylics are designed to allow the center of the acrylic to be separate from the seam allowance. This gives flexibility for fussy cutting and for using a pen or pencil to draw seam allowances onto the fabric. The windowed templates also have the choice of 1/4 inch or 3/8 inch seam allowance.