Stretchrite 3/4" Button Hole Elastic White (5 yd cut) Sold in 5 yard quantities. 72% Polyester 28% Rubber This ingenious 3/4" polyester/rubber elastic has holes 1" apart. Perfect for growing kids' clothes, maternity wear, and wherever you need a little adjustment. Simply rebutton in different hole to make tighter or looser. Can be inserted in a casing. Elastic that is stitched directly onto fabric does not return entirely to its original length.