Fake LEGO: Red Slope, Curved

[Jaco van der Molen]

Hi all,

Northing to do with LDraw, but wanted to ask here.
I ordered some bricks on Bricklink. Ten of these to be exact (among other parts)
 Red Slope, Curved

I think that one of 10 of these parts is fake LEGO.
It has no LEGO logo on the studs and no partnumber, copyright note and stuff in tiny letters on the inside. The inner detail is different too.
The material feels like cheap hard plastic, not like LEGO at all.
Dropping it on a smooth table even sounds different too.
Could this be a non LEGO part? It does fit though and clutch power is good, so no problem there. Color is good too.



See these photo's.
https://photos.app.goo.gl/RpE2vFqxWvZjqC1E2
What do you think?

Photo 1: studs with LEGO logo and studs without LOGO
Photo 2: zoom in to see left part no copyright LEGO and speckled surface (looks a bit like roofbricks), right part has little text and smooth surface
Photo 3: inner details thinner