Table: grado labs
[['headphone model', 'headphone class', 'driver - matched db', 'construction', 'earpads', 'termination', 'us msrp'], ['igrado', 'prestige', '0.1', 'plastic', 'comfort pads', '1 / 8 (3.5 mm) plug', '49'], ['sr60i', 'prestige', '0.1', 'plastic', 'comfort pads', '1 / 8 (3.5 mm) plug with 1 / 4 adaptor', '79'], ['sr80i', 'prestige', '0.1', 'plastic', 'comfort pads', '1 / 8 (3.5 mm) plug with 1 / 4 adaptor', '99'], ['sr125i', 'prestige', '0.1', 'plastic', 'comfort pads', '1 / 4 (6.5 mm) plug', '150'], ['sr225i', 'prestige', '0.05', 'plastic', 'bowls', '1 / 4 (6.5 mm) plug', '200'], ['sr325is', 'prestige', '0.05', 'aluminum alloy / plastic inner sleeve', 'bowls', '1 / 4 (6.5 mm) plug', '295'], ['rs2i', 'reference', '0.05', 'hand - crafted mahogany', 'bowls', '1 / 4 (6.5 mm) plug', '495'], ['rs1i', 'reference', '0.05', 'hand - crafted mahogany', 'bowls', '1 / 4 (6.5 mm) plug', '695'], ['gs1000i', 'statement', '0.05', 'hand - crafted mahogany', 'circumaural bowls', '1 / 4 (6.5 mm) plug', '995'], ['ps500', 'professional', '0.05', 'hand - crafted mahogany / aluminum', 'bowls', '1 / 4 (6.5 mm) plug', '595']]
Statement: the most expensive Headphone is Headphone Model Gs1000i
Statement: Igrado cost leaa than Sr60i
Statement: 5 of the Headphone are made of Plastic
Statement: Sr325is is the only 1 that is made of Aluminum Alloy / Plastic Inner Sleeve
Statement: 1 / 4 (6.5 Mm) Plug is the Termination of all but 3 Headphone