https://moonk-design.com/shop/taburet-montessori/ 
https://moonk-design.com/shop/taburet-montessori-dvukhtsvetniy/ 

Montessori Growing Stool with Removable Legs - When your child grows up, you can simply buy a new set of legs and not change the entire piece of furniture.

Material:
seats - birch plywood and MDF
legs - solid birch

S - suitable for children from 80 to 125 cm tall:

length: 47.5 cm
width: 29 cm
seat height from floor: 29 cm


M - suitable for children from 115 to 145 cm tall:

length: 47.5 cm
width: 29 cm
seat height from floor: 34 cm