Strait-Line Crayons The Strait-Line Crayons, available from Trade Counter Direct, are designed for reliable marking on a wide range of surfaces. These crayons are suitable for professional tradespeople who require clear, durable marks on challenging materials. Whether working on timber, concrete, ceramics, or metal, Strait-Line Crayons deliver consistent performance in various site conditions. Engineered for versatility, these non-toxic and waterproof crayons maintain visibility and adhesion even on oily, slick, wet, cold, or dry surfaces. Their robust formulation ensures marks remain clear and legible throughout the job. Features Suitable for use on oily, slick, wet, cold, or dry surfaces Ideal for marking timber, concrete, ceramics, and metal Non-toxic formulation for safe handling Waterproof for long-lasting marks Designed for professional trade applications Specifications Brand Strait-Line Product Type Crayon Suitable Surfaces Timber, concrete, ceramics, metal Properties Non-toxic, waterproof