A mat board is provided and is formed of a body having outer peripheral edges and an inner window formed therein. The inner window is defined by a sloped side wall that extends peripherally around the inner window and extends from a top surface of the body to a bottom surface of the body. The sloped side wall has an exposed convex surface, wherein corners of the inner window have curvature in that the top surface of the body in each corner is curved.

A Tool for making controlled cuts using a template cutting guide to facilitate the registration and cutting of a workpiece including, an elongated body portion having a top face and a bottom face separated by a thickness, a cutting guide slot sized to receive and control a cutting blade and extending through the thickness of the elongated body which may include guide lines with equidistant spacing. Additionally, the cutting guide may utilize push pins or fasteners to secure the cutting guide to the workpiece. The cutting guide allows the user to execute precise cuts in material such as mat board using a standard utility knife.

Embodiments of the invention include various different shapes and sized of templates having an inner voided space or inside shape produced by a plurality of internal edges. One or more slits, sized and proportioned to accommodate a rotary cutter, are positioned at corners formed between the internal edges. The templates are particularly useful for quilters to cut quickly and easily cut the requisite patchwork pieces needed to make a quilt using a rotary cutter. The positioning and sizing of the slits resulting in minimal fabric wastage. The templates are made from a durable material, including but not limited to acrylic, plastic, wood, metal, or any other resilient material known in the art. The acrylic or plastic templates may be colored or clear.