Pink lightning fluorescent lumber and timber crayon. Smear-resistant; no time-consuming trial and error crayon selection. Temperature range 40 degree f to 70 degree f (-4 degree c to 21 degree c). Stronger, less breakage. 75 Percent larger than 1/2"hex crayon. Fits the peterson #112 holder. Medium grade. Available in round (11/16" x 4-5/8").