Measurement and Estimation Pocket ChartExplores length, mass, temperature and capacity using customary and metric scales. Cards feature vocabulary, abbreviations, units, rulers and equivalencies. Additional cards include bricks for non-standard measurement and 41 objects to measure. Simply turn object over to self-check. 125 cards total including 12 double-sided, write-on/wipe-off. Also includes 10 plastic, 12" rulers. Flame retardant vinyl and nylon with three convenient storage pockets and grommets for easy hanging. Pocket Chart Type: Measurement and Estimation; Width: 40 1/2".