Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What are the earpads of the headphone with a plastic construction, an unknown sensitivity, and was succeeded by sr325?

### Inputs:
table_name: table, columns: ['Headphone Model', 'Headphone Class', 'Sensitivity (dB)', 'Impedance (Ohms)', 'Driver-matched dB', 'Construction', 'Earpads', 'Termination', 'Succeeded by']

### Response:
SELECT Earpads FROM table WHERE Construction = plastic AND Sensitivity (dB) = unknown AND Succeeded by = sr325