Become a master builder with STEM Explorers MathLink Builders. MathLink Cubes are the colourful connecting cubes that click together and twist apart. This STEM construction toy for children ages 5 and up helps children build skills in logical reasoning, spatial planning, and critical thinking and more through fun construction activities. This set includes 100 colourful MathLink Cubes blocks and a STEM Activity Guide with 10 fun building challenges.