This package of double sided foam pads is part of the Craft Perfect Collection from Tonic Studios. This package includes 609 squares that measure 5 mm x 5 mm x 2 mm thick or 0.1875" x 0.1875" x 0.078". These foam pads are black. They are perfect for any type of craft, gift wrapping, and 3D decorating. These squares are perfect for adding some dimension to your card mats and layers. These squares are made with strong, double-sided adhesive and provide a permanent hold within an hour, and are perfect for repositioning. These squares are acid free.