These dies are 1.5mm & due to the extra thickness are perfect for cutting through multiple layers of fabric as well as felt & leather, they truly are are a quilters dream! Perfect for embellishing quilts, home decor projects & so much more, you're sure to fall in love with these gorgeous dies! Debbie has used these dies on variety of fabrics & has found they cut up to:2 layers of oilcloth 5 layers of laminated fabric 2 layers of fleece 8 layers of organza 8 layers of taffeta 2 layers of thick denim 3 layers of jersey knit 3 layers of felt 6 layers of cotton 3 layers of faux leather 3 layers of linen 4 sheets 160 gsm card stock 3 sheets of glitter card 4 sheets mirror board This gorgeous Dragonfly Applique Die Set contains 5 individual dies. If using with cardstock, please do not attempt to emboss. Finished die size is Approx. 3.5" x 2.8" (88.9mm x 71.1mm)