ESP RZK Series is a line of guitars distributed by ESP. They are the custom guitars of Rammstein and Emigrate lead-guitarist Richard Z. Kruspe. The first model, the RZK-1, was produced with a custom platinum silver finish with a simplified Rammstein logo on the body of the guitar. Two new finishes, with variations in the pickguard color, were introduced at the Musikmesse Frankfurt show in early 2009. The RZK-1 was also produced in an LTD version called RZK-600 from 2005 till the end of 2008.