thanks everyone!
Cheng, I meant the black stuff around the swords.
sorry A.Baba

I missed the word 'sheath'
yes...its supposed to be (sprayed) black sheaths (if youre making, red sheaths would be historically accurate too...and also very striking

)
I know there are great customisers who would have made sheaths for them but at that scale, it would not matter (without) but a sheath would only make it even more bulky...imho

and WOT...
I made these long ago...I'll try searching but I think it was experimental(so I wouldnt have taken photos) and didnt think I'll keep these customs like this them till today
anyway, again, no secret technique...i just cut larger blue and smaller black squares of pvc stickers and stick the black over the blue...I'm not able to separate them to take photos..but I hope I explained it well...please dont hesitate to ask