You get as much as you like for .10 cents a foot plus shipping.  Great for bigger parachutes from 24" up to 32" or so.  If you need a little extra strength then order this stuff.  To see what this string looks like, see photo, it is the string nearest the quarter. 
WHEN PURCHASING STRING,  JUST ADD IN THE QTY. BOX HOW MANY FEET YOU WANT.  JUST PUT THE NUMBER IN THE BOX.  SO IF YOU WANT 10FT. JUST PUT 10 IN THE BOX AT CHECK OUT.