The Comfort Grip Magic Flat Head Pins Extra Fine are 0.6mm. They have a comfort grip flat head that makes picking up and maintaining a grip on the pin easy. These are strong and sharp pins which are ideal for multiple layers of fabric. The Comfort Grip Magic Flat Head Pins are also heat resistant, so if you iron over them, they will not be ruined. The pins come in a designer storage case that closes, so you won’t lose any pins.