LABLANCHE -Silicone Stamps. These high-quality silicone stamps will provide endless inspiration for anyone who uses them! Each stamp comes mounted on a durable 1/2 inch thick white foam block so you can stamp easily with minimal pressure. The silicone nature of the stamps is extremely heat resistant and makes for fantastically detailed designs. This package contains Hanging Hydrangea: one 3 1/2 x 2 1/2 inch stamp. Imported.