Irwin®, 64901, Marking Chalk, Standard, Blue, 8 oz Capacity, Bottle Package Type, Odorless Odor/Scent, 80 to 85% Calcium Carbonate, 15 to 20% Ultramarine Blue and 0.1 to 1% Silica

ITEM FEATURES:

• Interior or exterior use
• Marks are temporary
• Provides great visibility
• Powder type
• 8.5 - 9.5 pH range