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These lightweight, durable foam blocks are a perfect tool for additional support during transitions and poses. The various sides offer three different heights to meet your needs and goals. 9 x 6 x 3 Inches. Blue. Since 1986, Power Systems' passion for fitness has been fueled by our customers. Power Systems is committed to ensuring people have the tools to lead active lives with professional-grade products, cutting-edge educational materials, and elite customer service. “Power Your Potential” is the philosophy that guides everything Power Systems stands for.