Superstructs Arc-a-Teks-SKY Set comes with 42 pieces that are compatible with all the other Superstructs components You can make Jeter & Strut simlutaneously and get plans for a third Sky character on arc-a-teks.com All components are PP and ABS plastic and exceed all standards for toy safety All Superstructs components are easily cleaned--dishawasher safe Each set comes with an illustrated construction guide and cool collector trading cards