DescriptionMaterial made of plastic and alloy plated brass. Tight rubber pin back: the pin back is tight and they are not easy to fall off; Half round shape handle on the pin back is designed for easy grasp. Package includes: 100 pieces pin backs, 100 piece blank pins, enough for long time use.Feature- Color: Random color - Material: Plastic. - Size: 1x1x0.6cm. - Material made of plastic and alloy plated brass. - Tight rubber pin back: the pin back is tight and they are not easy to fall off; Half round shape handle on the pin back is designed for easy grasp. - Pin backs color: black, white, grey, yellow (each color has 25 pieces). - Package includes: 100 pieces pin backs, 100 piece blank pins, enough for long time use.