These are really nice blocks. They are about the same size as most of the other Haba blocks, which is nice because they fit in with the others when building or stacking. One of them is an acrylic prism, and one has a bell. Another one is a “kaleidoscope” as Haba calls it, which sparkles in the light. My little girl really likes the kaleidoscope. These blocks are appropriate for infants/toddlers through much older kids.