The Probst 51800125-002 PaverMARKER™ Marking Crayon 100/Case is a wet/dry marking solution designed for use on pavers, block, and stone. This highly-visible marking crayon marks nearly all concrete products with a constant line thickness, allowing pavers to be accurately cut to fit. While durable enough to remain in place for a while, it will not leave permanent marks, ensuring a clean, professional look.