-All X-Bar sets are compatible with each other and come with colorful builder’s guide.

-High Resistance PC Plastic which will Not break or crack; PA-FREE plastic comes in 6 bright colors

-Product Dimension: Metal ball 1.25” diameter, long bar 4.5”x.5”, short bar 2.75”x.5”, curved bar 3.5”x.5”.

-Patented cogwheel structure (U.S. patent pending) allowing stronger binding strength compared to other leading competitors’ products.