Penny Black Slapstick Cling Rubber Stamps. Penny Black stamps feature high-quality images in red rubber with a 1/8 inch foam pad for maximum transfer. Stamps are available in a wide variety of themes and designs for every day and every occasion! This package contains Birthday Hoopla: one cling rubber stamp on one 6 1/4 x 5 inch backing sheet. Measures approximately 3.6 x 4.9 inches. Made in USA.