The Kolb joiners add a degree of dihedral at the poly break to each side of the wing and are made with special carbon that matches the bending of the PERFECT Spar.

I now have Kolb joiners in all of my competition PERFECTS and would never consider flying anything else. The below 50 foot handling of the PERFECT has improved dramatically. It makes the model come alive and allows it to turn effortlessly. Try a set- you'll be glad you did!  Always in stock!