Thin arms for the ImpulseRC Alien. At 4mm thick and 10mm wide, they're less durable than the original arms, but offer increased performance. Using just 2 screws per motor, applying threadlocker is highly advised.

With a typical 5" thrust of 1300g per motor, these arms offer 182g more thrust overall compared to the original arms since they block less prop area. In addition to increasing thrust, the thinner arms also reduce drag for faster acceleration and higher top speeds.   

Finally, the arms weigh just 10 grams compared to the 13.8 grams of the original arms, reducing frame weight by 15 grams. An additional 2.5 grams are saved by using 2 screws.

Sperberframes.com

Replacement bottom plate for the Sperber X34. 

3mm thick, chamfered and weave aligned parallel to the arms.

Sperberframes.com

Replacement top plate for the Sperber X34.

2mm thick, 16mm wide. 

Replacement arm for the BFight 210 

Here's the original, I copied it because it's often sold out and Armattan CF looks better.

Replacement bottom plate for the flyfox no5 frame. Original plate always breaks at the same place, so I redesigned the motor mounts.