and a line of Sesame Street building sets in 2008. In 2010, K'Nex released a brand of sets based on the monster truck live tour Monster Jam. Trucks released were Grave Digger, Maximum Destruction, Monster Mutt, Blue Thunder, Avenger, El Toro Loco, Grave Digger the Legend, Son-Uva Digger, Advance Auto Parts Grinder, Monster Mutt Dalmatian, Air Force Afterburner, Mohawk Warrior and Captain's Curse (who was never released in the standard size). The trucks would be released in standard or mini size, and featured working suspension. Standard size trucks included a driver figure (most of which were cartoonish representations of actual drivers), and they would occasionally come in doubles. Mini sized trucks would come paired with another truck. The triangular boxes they came in could also be used as a ramp for the truck. The line was discontinued in 2013. In 2011, K'Nex released a brand of Mario Kart Wii building sets with buildable karts and tracks as well as items and enemies from the series like Bullet Bills, Chain Chomps, Goombas, and many others. This set came with Mario, Luigi, Bowser, and Yoshi as the racers. Other licensed products that K'Nex has issued in recent years include Lincoln Logs, Tinkertoy, Angry Birds, KISS, The Beatles, Family Guy, and Monster Jam. By 2011, K'Nex was distributed in over 25 countries, including the United States. In 2018, all of K'Nex's assets were purchased by Basic Fun!, a Florida-based toy company. The acquisition was valued at around $21 million. Pieces The basic K'Nex pieces used to make models include rods, connectors, and bricks. Basic K'Nex pieces are made out of polyoxymethylene plastic. K'Nex rods come in a range of lengths. The shortest rod length allows connectors to be immediately adjacent. When the additional length of connectors is taken into account, the ratio between successive lengths of rods is . This simplifies the construction of right-angle isosceles triangles, and these triangles provide structural strength in models. Most types of K'Nex rods are only slightly flexible, but there are extra rigid and very flexible versions of some of the longer rods. K'Nex connectors also come in a range of types, each having a different number of slots. They can link the rods together in different ways. The first way is to insert the end of a rod into a slot on the connector, where it snaps firmly into place. Rods connect at angles which are