One b&w consumable pb workbook; one b&w and blue, non-consumable pb textbook; Home Instructor's Guide. US Edition.
If you have not used Singapore Math® before please go to Singapore Math® Overview for a complete description, samples, placement guide, and a placement test.
Primary Mathematics 4B Textbook Samples
Primary Mathematics 4B Workbook Samples
Primary Mathematics 4B Home Instructor's Guide Samples