Lasts longer up to 4x the writing life compared to ordinary crayons and fluorescent markers * Reduced color transfer to machinery surfaces; fewer misreads * Easier clean-up and less downtime; Bright, clear marks eliminate missed scans * Size: 1/2" hex by 4-5/8" length * Standard 1/2" hex shape fits the holder #109 peterson holder, #106 holder and #108 holder