The 3"x 6"x 9" Yoga Blocks are strong, firm and comfortable. Yoga blocks align the body and help support the weight so various poses can be performed. They have beveled edges, so they can be packed and stored easily. Yoga blocks are used by people who need a little help in their poses or are in the mid to late stages of pregnancy or have injuries. Yoga blocks align the body and help support the weight so various poses can be performed.