CREATE TABLE table_41550 ("Headphone Model" CLOB, "Headphone Class" CLOB, "Sensitivity  ( dB ) " CLOB, "Impedance  ( Ohms ) " FLOAT, "Driver-matched dB" CLOB, "Construction" CLOB, "Earpads" CLOB, "Termination" CLOB, "Succeeded by" CLOB)

What are the earpads of the headphone with a plastic construction, an unknown sensitivity, and was succeeded by sr325?
SELECT "Earpads" FROM table_41550 WHERE "Construction" = 'plastic' AND "Sensitivity (dB)" = 'unknown' AND "Succeeded by" = 'sr325'
SELECT "Earpads" FROM "table_41550" WHERE "Construction" = 'plastic' AND "Sensitivity (dB)" = 'unknown' AND "Succeeded by" = 'sr325'