FYI - Clover's flower pins say "Head is not heat resistant. Do not apply iron directly." Considering that I generally keep my iron at a hot setting (cotton/linen), I wouldn't want to use any plastic headed pin.
Here is a link to Clover's line of glass head pins. My preferred pins are the Clover patchwork extra fine (40 mm). If I use the longer ones ("quilting" pins), I stick myself too much.
http://www.clover-usa.com/search?q=g...y=0&t=products (first page only)