Feature: The head is transparent plastic a pattern the needle is spiral with it to decorate or repaired are very good choice Operation is also very simple and convenient Spiral needles can make them firmer If you do not want to organize the sheets every morning, you can use it to keep sheets and mattresses together you just need to insert these metal pins into the upholstery without tearing or snagging and they will grip firmly just simple like that So why not just give it a try Tips: The needle is sharps Please keep your kids away from them. Application: Ideal for medium to light weight fabrics, bedskirts, slipcovers, upholstery and bed ruffles. Upholstery Twist Pins are used to help hold fabrics in place. They twist firmly into place and remove easily by coiling in the opposite direction and they will not harm your fabric. Material: Plastic&Alloy, Color: As Picture Show, Size: Every one with 0.5 inches in diameter, and wire twist 3/8 inches long. Note: Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 50 PCS X Heads Twist Pins. The head is transparent plastic a pattern the needle is spiral with it to decorate or repaired are very good choice Operation is also very simple and convenient Spiral needles can make them firmer If you do not want to organize the sheets every morning, you can use it to keep sheets and mattresses together you just need to insert these metal pins into the upholstery without tearing or snagging and they will grip firmly just simple like that So why not just give it a try