Comfort Grip, Heat Resistant, 50pc. The Comfort Grip Magic Pins Fine Silk Pins are 1 7/16 and .5mm. They have a comfort grip head that makes picking up and maintaining a grip on the pin, easy. The Comfort Grip Magic 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 wont lose any pins!