... good quality magnetic ballast lighting fixture No.: OA004Name: ODS Inductance Super-quiet Blackboard LampsItem No.: 20W-40WBrand: OUDESHI ... (ODS)Charateristics:1. crust designed for arc-streamline, attractive ... , contact tight-and-loose, security.4. collacating high quality ODS ballast, noiseless, low temperature rise, saving energy and more ...