<br><b>Feature:</b> <br>This listing is for 40 pcs Low Profile Locking Pin backs/Pin Keepers-Highest Quality, Best Available; Suitable for all pin post pins, especially for disney pins, harley pins; <br>Great alternative to those standard butterfly clutches and the rubber backs; These pin backs are very easy to use; No Tools Required; Just push on the pin back to the pin nail and it is locked; the harder you pull the pin, the tighter it will lock; pull the spring loaded botton at the rear, then the pin will be released ! Low Profile, smooth surface, No finger stabbing, No pin post protruding any more! <br> <br><b>Specification:</b> <br>Material: nickel-plated copper <br>Product Size: circumference approx 15cm/5.9 inch(unstretched); <br>Product weight:0.04 ounces*40 <br>Package size:3.22*2.36*0.59inches <br>Package weight: 2.41 ounces <br> <br><b>Package includes:</b> <br>- 40* Locking pin keepers backs <br>- 1* Storage case