Our chalk factory located in Hubei Province, China. We produce all kinds of high quality chalks and related products with 20 years' technology and skills. 1-capacity:300,000,000 chalk sticks per year 2- packaging: We supply 4-color printed box, PVC box, blister card, showing box and other. As customer request 1,2,3,4,5,6pcs/box; 10,12,16,30,50/box,60,100,144/box and so on. 3- specifications: European specifications no.3 part en 71/3 of 1999. 4- product and raw material are tested in the royal scientific association(rsa government labs) and S. G. S Shenzhen office China. 5- features: - non toxic chalk ; - dustless ; - easily erased ; - smooth writing ; - does not scratch the board ; -weight 4-5 gram/stick. According to ISO 9002 specs. ; - available in all colors ; - tapered chalk 76(l)*12(dia)*10(dia) mm ; - tapered chalk 76(l)*9(dia)*10(dia) mm ; -straight chalk 80(l)*10.0(dia)*10.0(dia)