Similar to the mat, you’ll find the Moon Phases design on either sides of each block. They are not heavy and this was done intentionally. These blocks will offer just enough support and stability during your practice without ensuring that you become reliant on them. They are not designed to support entire body weight but rather to facilitate postures that are new in your practice to help develop alignment and balance. TIP: They are useful for postures like triangle, splits, lizard, half moon, warrior 3.