PICA Visor/ Sakura Crayon

The PICA Visor and Sakura Crayon are types of 'marking chalk' that can be used on almost all surfaces, wear-resistant and waterproof. From glass and rubber to concrete.

The more standard types of 'marking chalk' are more specific in their application.
For example, the Lyra 797 or ZHK chalk for wood cannot be used on glass, rubber, or other smoother materials.

The softer types of chalk (with more wax), such as the ZHK marking chalk (hexagonal), Lyra 798, or Lyra 4930, mark well on metal and as road chalk, but cannot be used on rubber or glass.

The LYRA 4920 Plast-O-Glass, the ZHK marking pens, and Lyra 4950/4940 Mark-All chalk are better suited for use on glass, rubber, etc., due to their higher wax content. They can also be used on concrete, for example, but they wear off quickly.