These quality cling-mount rubber stamps are made from deeply etched, precision trimmed premium grey rubber. With 1/8" thick grey foam for a smooth impression on uneven or textured surfaces! Deep Red rubber stamps are beautifully detailed and made a proprietary blend of high grade natural gum rubber. This means better ink transfer so you get fantastic impressions on a wider variety of surfaces and papers. They are durable and safe to use with any crafting inks.