They were selling the blue/white chalk pencils, with the eraser brushes on the caps, as part of a different kit last year.
I bought some, and frankly they are rubbish. Dry, brittle and crumbly, they leave very faint marks, and even that falls off as soon as you move the fabric.
Can't speak for what the rest of that set is like, but if it's anywhere near the same quality as the pencils, then maybe best to give it a miss.