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This mesh mesh uses a 256x512 texture. Other sized textures will distort the opacity map. 

Always match texture size with opacity map size

If you use a 256x256 texture, it will have rings.  

I apologize for the weird mapping, those two were supposed to be on 1 material

Green Part of Lightbulb

Strands

All other pieces are a square map

This mesh has a built in scaler for you creators

By changing the ScaleAbsolute values you can resize the mesh 

Change all three values uniformly or the mesh/animation will warp!