White Strong & Flexible: White nylon plastic with a matte finish and slight grainy feel.
About this Product
These shapes have constant width... i.e. if you put all three on a table and put a book on top of them it would roll about like there were ball bearings under it, even though these ball bearings aren't spherical...
Some assembly required (gluing the base onto the top part) for each of the three shapes. The edges may have to be sanded gently to ensure a tidy fit.