Filter—B+W 091 Deep Red
Graphs are in nanometers. Visible light is approximately 390 - 650 nm (the human eye can see very weakly into the 700-800nm range). Graphs used by permission of Coastal Optical System.
A great source for filters at competitive prices is B&H Photo. Get filters at B&H Photo.
The B+W 091 filter has a real benefit with some EOS cameras converted for infrared use; see the diglloyd Guide to Digital Infrared for details and examples. Get the B+W 091 infrared filter at B&H Photo.