PK-66 Ultimate Fin Set

Swapped these onto my 4-inch build after cracking a balsa fin on a hard landing, and the six-pack gave me two spares for future repairs. Being 1/8-inch thick, they feel way sturdier than the stock pieces I had before.

The 1/8-inch thickness gives these fins a solid, rigid feel that handled the build without any warping. Six in the pack meant I had spares in case I messed up a cut, which was a relief. They mounted cleanly and the rocket flew straight as an arrow on its first launch.

Cut these to size and they’re perfectly uniform, no warping or rough edges anywhere across the set. The 1/8-inch thickness gives them a solid, rigid feel that should handle the flight loads without any flex. Six fins is plenty for spares or a second build, which makes this a practical buy for anyone