PURPLE COWS-Craft Iron Stamping Tips. These interchangeable tips are great for searing; melting; singeing or burning detail into leather; wood; synthetic fabric and acrylic. Each tip can be used with the Sizzle Craft Iron and the Melt Craft Iron. This package contains six Stamping tips: FS-1 (Heart); FS-2 (Circle); FS-3 (Oval); FS-4 (Square); FS-5 (Star); FS-6 (Triangle). Imported.