Thank you for viewing. This is a set of teaching materials used in Montessori education. I used these for practice to obtain my diploma, and my child also used them. The knobbed cylinders include 10 pieces, and the pink tower and brown stair are the official sizes, with the largest side measuring 10 cm. I purchased all of them new from an online Rakuten shop. 【Pink Tower】 The largest cube has a side of 10 cm, and all 10 pieces are present. This is a sensory material that can be used from 2.5 years old. My child used it the most, so there are some paint chips and scratches. I have taken photos as much as possible, so please check the condition. There are no problems with use, and I think it is sufficient for home use. In addition to activities where children stack them in order of size, there are various advanced activities such as matching the smallest cube to the width created by stacking them together, removing one cube and returning it to its original place, and different arrangements. Children intuitively learn the concept of "big" and "small" (symbol grounding). 【Brown Stair】 The base of the largest rectangular prism is 10 cm, and all 10 pieces are present. This is a sensory material that can be used from 2.5 years old. There are some paint chips and scratches here and there. I have taken photos as much as possible, so please check the condition. There are no problems with use, and I think it is sufficient for home use. This is a teaching material that allows children to intuitively learn "thick" and "thin". In addition to activities where children arrange them in order of thickness, there are various advanced activities such as matching the smallest rectangular prism to the width created by arranging them, removing one rectangular prism and returning it to its original place, and different arrangements. There are also various variations of advanced activities that combine the pink tower and brown stair. 【Knobbed Cylinders】 There are 4 sets containing 10 cylinders each, and all cylinders are present. This is a teaching material that can be used from 2.5 years old. This was not used very often, and there is no noticeable damage. First, use the cylinders that are the same height but different in thickness. Line up all the cylinders in front, and have the child return them to their original holes. After that, do the same with the other three sets. As they get used to it, you can also do activities using two, three, or four sets at the same time. There is no problem with using them, but please refrain from purchasing if you are looking for something like new. I plan to ship via Rakuraku Mercari courier service, size 160 (shipping cost about 1700 yen).