Prima Marketing 3 in. x 4 in. Clear Stamp - Rossibelle 587499. This stamp set measures 3 in. x 4 in. and includes 8 clear stamps, the largest one measuring 3 in. x 2 1/4 in. Love the little bird! This acrylic stamp is the perfect size for Artist Trading Cards to make amazing backgrounds for ATCs, greeting cards and other projects. Just place the stamp on an acrylic block, and go!