All Yoga Blocks aid your practice by bringing the floor closer to you to avoid injury. These 3"x 5.5"x 9" EVA Foam Yoga Blocks will help: You to modify poses to accommodate your level of flexibility. This can be important for beginners and inflexible people. They are firm, light-weight, EVA foam blocks with beveled edges. EVA is the non-toxic, recyclable foam. Any style yoga block will help in bringing the floor closer to you, causing less accidents and muscle pulls. This way you can attain positions while your body stretches to meet them. Yoga can be for everyone and we all start with different advantages and disadvantages. I was injured a while back and will never be the same physically. Where I used to be ultra flexible, I now need all of the help I can get. Blocks, straps, sandbags, patience, and just about every other aide that YogaBody2 sells are my friends. My yoga life is now in my changed YogaBody (#) 2. It's a good thing yoga isn't all about your body, but it can help any body, mind and spirit. They are available in Blue, Purple and Black Also available in 2 Pack- see 44-2 These are recyclable EVA foam blocks and are made in different colors. EVA has little or no odor so at least you are not breathing in toxins when you use an EVA foam block. But, EVA (also known as Ethylene vinyl acetate) is the co-polymer of ethylene and vinyl acetate. They are firm, long lasting and can be recycled, but it can take centuries to fully biodegrade. But as foams go, these are about the least harmful to the environment and they are so light, you can use them for travel. I am told that very little chemical product is used because they are so light and small. You decide what type of block you want to use.