A rapid downward blotting device for high-resolution transfer of DNA and RNA. No heavy weights are required on the top of the transfer stack, eliminating the messy setup of standard upward capillary transfers.- Nytran SPC TurboBlotter Refills, Large, 15 x 15cm, Includes: (5) Membrane Sheets, (40) 3MM Chr Sheets, (100) GB004 Sheets & (5) 3MM Chr Wicks, 1/pk 14-21 Days