BOULDER ZERO is a liquid chalk with a non-slip effect. - Brand: BOULDER - Model Name: ZERO - Type: Liquid Chalk Thank you for viewing. I purchased this new at a gym about 10 years ago and used about 1/4 of it. I have stored it in a closet, so I don't think there is any sun damage, but it is a used item, so please consider purchasing only if you understand this.