Model Rocket Fins

For the junior from I neighbor I had to make some rocket fins, this was done just quick and dirty, but maybe somebody can use it as well.

Thickness is 3mm.

We use this rocket tube:
https://www.raketenmodellbau-klima.de/Raketenmodellbau/Zubehoer/Ersatz-Bauteile/Koerperrohre/Koerperrohr-35mm-385mm-4-Schlitze.htm?shop=raketenklima&SessionId=&a=article&ProdNr=203538504&t=23&c=83&p=83

The size for the slot is 20x3mm

Feel free to visit my Youtube-Channel:
https://www.youtube.com/channel/UCIo-Dpw58bae5IMvbkYsOuw