These brooch pin backs are made of plastic, resin material, small in size, lightweight and durable for long time use. Applicable to uniform, badges, name tags, brooch, tie tack lapel. Also can used for jewelry making and DIY craft projects. Features -Color:Assorted Color -Material:Plastic, resin -Size(back):1.60X1.40X0.30cm/0.63X0.55X0.12in -Size(needle back):1.00X0.90X0.90cm/0.39X0.35X0.35in - These pin backs are awesome! because they keep the pin from moving around. - Pin backs lock pins firmly and secure pins in place, no worry about losing your meaningful pins. - Pin back effectively isolate sharp pins and ensure they remain in place, great replacement for pin clutch backs. - Put the pin in the rubber pin backing, your items will keep pinned securely. They have great grip, and don't loosen with time. - Each pin back has a hole which is compatible with the tie tack pin, it can't fasten if the pin is too slim. Package list: 1 of Pin Backs