TREND enterprises, Inc. Physical Science Learning Charts Combo Pack, set of 5 Convenient, well-designed five-chart pack for Grades 2-9 helps present key physics concepts. Includes: Electrical Circuits, Simple Machines, Laws of Motion, Magnets, and States of Matter. Extra Value: Back of charts feature reproducible activities, subject information, and helpful tips. 17" x 22" size appropriate for classrooms as well as smaller workspaces & home use.