This is a pair of screw on dual texture cracks.
You can set them how you want them, flared or parallel. Flip them sideways and you have a tricky slot to aim for.
You have to use the inside of the crack because the smooth outside is useless for pulling on.
You can use them individually as big edges if you want. Great to teach people how to jam a finger crack, as its about 2.5" deep in the middle
Made from hollow PU
You can pick a colour, the option is above the price