Porcelynne Black Brushed Back Strap Elastics - 3/8" or 10mm - 5 Yards Plush backed elastics can be used for numerous crafts and sewing projects including lingerie and bra making. Ideal for straps, waistbands and headhands. All our strap elastics are made of nylon and can be dyed with synthetic dyes. They are available in 5 yard increments, but will be cut to order in full lengths.