The Diablo Matrix was a spool valve type marker. It retailed for $800 when it was released.. In mid 2002, Diablo released the Matrix LCD. It retailed for $1000, and was basically the same as the Matrix but with different circuitry and barrel. Generation E ceased production when Dye Precision aquired the patent. To this day, the Matrix and Matrix LCD are the only high-end and expensive markers released by Diablo.