"To use this insert you will need the Sizzix Dimensional Diffuser: Rectangle Starter Set by Stacey Park (666780). The Dimensional Diffuser Accessory: Oval Plate and Insert by Stacey Park provides even more possibilities to the Sizzix Dimensional Diffuser: Rectangle Starter Set. Adding depth and dimension to your designs this set creates a striking oval diffused area to elevate your craft projects. Let your creativity shine and take your creative makes to the next level with ease and precision. This insert works perfectly with our Revealz Sandable cardstock packs."