This International Standard specifies safety requirements for taps for writing and marking instruments which are designed or clearly intended for use by children up to 14 years of age. A test procedure for verifying the cap Performance is given in annex A. Caps for writing and marking. instruments which are not designed or intended for use by children, e.g. jewellery pens, expensive fountain pens, professional technical pens, as well as transit taps for refills are not covered by this Standard. NOTE 1 Caps which do not comply with clause 3 should have the instrument or its packaging labelled with a waming as to the dangers of asphyxiation from pen taps.