Roku is another high quality chalk manufactured by Kamui. It was released in July 2018. I had an opportunity to get a pre-release version of this chalk back in April, which is the basis for this review. The pre-release version I reviewed is exactly the same as the official production released version of the chalk. The Roku chalk is another in the line of premium chalks. These premium chalks such as Kamui Roku or Great White are quite a bit more expensive than standard chalks