Why are ballpoint pens retractable

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STABILO STABILO, ballpoint pen, foil pen (multi-colored, 1mm, 8)
STABILO STABILO, ballpoint pen, Easy Original (Blue, 0.50mm, 1)
STABILO STABILO, ballpoint pen, EASYORIGINAL - holograph rollerball pen (green)
STABILO pointball ballpoint pen, assorted colors, 4 pieces
STABILO pointball ballpoint pen, document-proof, blue
STABILO pointball ballpoint pen, document-proof, black
Ballpoint pen »SMARTball« blue, Stabilo
STABILO pointball ballpoint pen red
STABILO pointball gel rollerball green
Ballpoint pen »SMARTball« green, Stabilo
Ballpoint pen »SMARTball« orange, Stabilo
4-pack of ballpoint pens, blue, Stabilo
Stabilo pointball 6030/6 assorted ballpoint pen 6
6-pack of ballpoint pens, blue, Stabilo
Stabilo pointball 6030/41 blue ballpoint pen 0.5
Stabilo pointball 6030/36 green ballpoint pen 0.5
Stabilo pointball 6030/40 red ballpoint pen 0.5 M
STABILO ballpoint pen pointball orange, writing color blue
Stabilo pointball 6030/46 black ballpoint pen
Stabilo SMARTball 2.0 1852 ballpoint pen blue
STABILO ballpoint pen pointball orange, writing color black
STABILO ballpoint pen pointball orange, writing color red
STABILO ballpoint pen pointball orange, writing color green
STABILO pointball ballpoint pen, blue
STABILO ballpoint pen, orange, turquoise ink
STABILO ballpoint pen pointball orange, writing color purple
4 STABILO ballpoint pen, orange pointball, color-sorted
STABILO pointball ballpoint pen, black