MyBuild Patented Block Building Toy Main Building Frame Versatile building blocks, which are compatible with other major brands' blocks. Well balanced design suitable for continuous construction, our patented design. For ages 12 and up and excellent for whole family working together, a must for Christmas This is the building frame for all our MF series robots. 21 pieces in the pack. It takes 19 pieces to build Base Defender and Green Trooper frame, 21 pieces to build SWAT and Machinery frame. Well supported and clear building instruction and video demonstration. A MF05-G01 cover parts will be included.