These manipulatives from Melissa and Doug are musts for your lesson plan on geometry. Skill-building is just part of the fun! Rings, octagons, and rectangles can be slotted onto the three dowels, stacked on top of each other or lined up to compare shapes, sizes and colors. Tactile learning makes remembering concepts easy for younger students! Wood. (26 pcs. per unit) 8 1/2" x 3 1/2" x 11" © 2016 Melissa & Doug, LLC. All Rights Reserved.