Thick, strong, smooth chalk. [Use] Replacement chalk. [Functions and Features] Replacement chalk for retractable chalk. Chalk for marking wood, concrete, metal, plastic, and stone. [Specifications] Thickness: 0.1 inch (3.8 mm). [Materials] Chalk: Paraffin Product Size: Width 0.8 x Height 4.1 x Depth 0.08 inches (20 x 105 x 2 mm); Weight: 0.2 oz (7 g); Product Code: 496058707771; JAN Code: 496058707771; Brand Name: Tumble; Product Name: Knock type chalk refills; Standard: NO. Do not eat or drink. Avoid storing in direct sunlight or high temperatures.