Masione Yoga Block Foam Bricks Exercise Fitness Yoga Pilates 9"x6"x3" (Blue/Purple, 4 Packs) Blocks(Set of 4 Peace) are slip resistant, stability and balance to help with optimal alignment, deeper poses and will enhance your yoga practice, with rounded edges for a comfortable grip You can use blocks for almost all poses to engage certain muscles and protect your back and joints in certain poses When you are in poses that you need to maintain a long spine but cannot touch the ground, the blocks will come into play, accommodates your level of flexibility Yoga blocks are made from high-density foam for long-lasting durability and are lightweight about 0.19lb each one, but if you stand on them they will hold your weight; Size: 22.5x14.5x7.5cm /9"x6"x3" There is no any unpleasant odors, but it is best to leave them outdoors in direct sunlight for a few hours to accelerate the drying before or after use