ROBERTSON 5M10067 IS64P /A Bulk-Pak of 6 Fluorescent mBallasts for 1 F72T8, F64T6 or F42T6 Linear Lamp, Instant Start, 120Vac, 60Hz, Normal Ballat Factor, HPF Also available as a Quik-Pak of 10 units individually packaged as 2M10067 Also available as a single quantity as 3M10067 Commercial grade. Two Year Factory Warranty Go to RorbertsonDirect.com for complete technical data. Take advantage of Robertson's 60 years of electronic design and quality manufacturing experience.