Wide range of uses: Can be used in most compasses and pencils with replaceable refills and general writing applications such as notes, letters, drawings, suitable for different occasions like home, office, school, etc Dimension information: HB model, 2mm in diameter, 1cm in length, easy to carry and put in your pencil cases; Safe material: They are made of graphite, non-toxic and reliable, safe for hands and body, let you use them safely Portable: Comes with a storage box for easy use and does not take space Large quantities: Comes with 2 storage tubes and 10 refills for each tube, 20 pencil cores totally, enough quantity can satisfy your daily use2 Pieces 2mm HB compass lead refills replacement leads in compass refill tubes, good for math drawing elaboration Wide range of uses: Can be used in most compasses and pencils with replaceable refills and general writing applications such as notes, letters, drawings, suitable for different occasions like home, office, school and more. Note: Products are small items, please do not play for children under 3 years old. Portable: Comes with a storage box for easy use and does not take space Specifications: Diameter: 2 mm Length: 10mm Color: black Material: graphite Quantity: 20 pieces (2 tubes)