Bag of 100 pc, the p clamp accessory comes in a variety of sizes from 1/8″ to 1″ and is used to attach hard tags to items that can not be pinned. For example to attach a hard tag to a leather purse just run the p clamp around the purse handle and pin the p clamp to the hard tag. For more information about Sensor Tags visit; http://www.sensortags.com