This classroom set of desk top number lines features 15pcs of -10 to 10, 15pcs of -20 to 0, and 15pcs of 1 to 20. All sets have blank calibration on reverse side. The write-on wipe-off feature makes the Number Line a convenient tool for teaching. Learning Skills: - Counting - Adding - Subtracting. Set includes: - 45 pieces - Packed in a Polybag Age: 6 Years + Item Size: 5.7(H) x 30.9(L) x 3.3(W) cm Material: Non-Toxic Plastic Warning: CHOKING HAZARD-Small parts. Not for children under 3 years EDX products are tested for compliance with EN71, ASTM and CPSIA standards. All EDX products meet the ISO 9001 accreditation requirements. EDX is committed to becoming carbon neutral through re-using, recycling and improving energy management. What's in the box 45 pieces Packed in a Polybag