All SFE Kites have individual spars that are splined according to each kite, this takes into account both measurements and the breathable cloth material each kite is made of. This is what separates the SFE Kite from all the others. SFE Kite’s impeccable peformance is due to the quality craftsmanship that goes into each kite, proudly Made in the USA. Note: Contrary to popular belief, these spars only work on SFE kites.