These crayons are of the highest quality. Moulded into a honeycomb section tray, the block stays secure and does not break. Made using natural waxes, including beeswax, these crayons give a super quality mark with better durability whatever the weather. Even on wet fleeces these blocks leave a good mark and the high level of pigment together with fibre included in the formulation means that these blocks leave a highly visible mark and need no rasping during use. Secured to the harness with the unique and easy to use split pin which is re-usable, only finger tip pressure is required.Please note Images shown may not represent exact sizes colours types etc