These blanks come in two colors: White and Clear.
Both blanks (white and clear) are good for sublimation. These comes with a protective layer that needs to be removed prior to sublimating.
Size of Thinner Paper Clip: approximately 2.5" x 1" / 3mm thick
Once you heat the acrylic blank, it will soften. Therefore, let it rest on a flat surface before peeling the sublimation transfer sheet and place a flat heavy object on top of the blank until it cools to touch. This will help prevent warping or defects to the blanks. Then you can repeat previous steps when sublimating on the opposite side.