Spectra Pre-Inked Stamps feature a soft grip mount. They come with five times more ink than a self-inking stamp. Spectra Self-Inking Stamps are usually good for around 5,000 impressions. The Spectra Pre-Inked Stamps are good for 25,000 impressions, and both stamps can be re-inked for thousands more.
These stamps use an oil based ink similar to the Xstamper Pre-Inked Stamps. These stamps have a faster recovery time than Xstampers if you are stamping many times in a row. Xstampers have the advantage in terms of long term durability.