Durable steel ball tip marks on smooth or rough surfaces. Marks with real paint and dries in 5 minutes. All colors are low in chloride making them safe for marking stainless steel and nuclear applications. Marks on vertical or overhead surfaces without running or dripping. Durable Steel ball tip is resistant to very rough surfaces for long marking life. The aluminum squeeze tube and thick paint makes it suitable for rough, vertical and overhead surfaces with excellent adhesion on oily and wet surfaces. Xylene-free paint reduces user health risks