BYS a is Australian born brand which is fairly newish to the UK, being stocked here online, or if you have access to a Store21.
These fat pencils seem to be a cross between MAC shadesticks and US brand NYX Jumbo Pencils.
I picked up the shades Pink Shimmer and Dark Blue Shimmer.
The packaging is a little like MAC, also having twist mechanism so no sharpening.
At £2.00 a pop they are very pigmented and glide on like butter.
They do seem to be more metallic than shimmery! I did also notice a vanilla scent almost identical to MAC lip products, which is rather strange for a eye product. At first I thought maybe they're multi-use but at the bottom of the pencil, it's says 'e/shad'.
Other then that these are very pretty, they would look wonderful in the inner corners and lower lash lines. Or maybe they could be used to perk up other shadows!