Picket Fence Studios 4in x 4in Stamp Set - Sweater Pattern Maker - If it's sweater weather time, you're going to want to create warm and cozy things with the Sweater Pattern Maker Clear Photopolymer Stamp by Picket Fence Studios. There is one clear stamp included in the package that comes one 4in x 4in storage sheet. The stamp can be used with an acrylic block and your favourite inks (sold separately).