New England Biolabs provides a color-coded 10X NEBuffer with each restriction endonuclease to ensure optimal (100%) activity. Most of our enzymes are supplied with one of four standard NEBuffers. These buffers contain Recombinant Albumin (NEB #B9200). Over 215 restriction enzymes are 100% active in rCutSmart Buffer, making it significantly easier to set up your double digest reactions. Since rCutSmart Buffer includes Recombinant Albumin, there are also fewer tubes and pipetting steps to worry about. Additionally, many DNA modifying enzymes are 100% active in rCutSmart Buffer, eliminating the need for subsequent purification.