Die-Versions Whispers Die, 3.5-Inch by 3.375-Inch, Heart Pops Whispers die Thin; chemically etched dies that are design to cut cardstock; vinyl; vellum ;foam; thin chipboard; cork; metallic paper; felt and more Compatible with most die-cutting systems like Sizzix; Spellbinders; Cuttlebug; and Quickcutz