Review on ZONEBIKE Mlock Picatinny Rail Section 5-Slot 9-Slot 11-Slot 16 Pcs Screw And Nut 6 Pcs Ultralight Rail For Mlok System by Jeff Rothstein

They seem to be a sturdy polymer and come with metal screws and bolts. Like others have said though, they are this weird dark gray color instead of black. I bought them hoping they'd match Magpul's "Stealth Gray" color. They do not. Stealth Gray is more of a blue gray, these are a more neutral gray. It kind of leaves you wondering what the point is when there are dozens of cheap rails you can buy on Revain that do the same thing but are actually black.