B-SAFE Hard Tags, made by high-quality materials, excel for high Q-factor value, strong radio signal and durability. 3 kinds of lock system are provided by B-safe: standard, strong and B-safe Lock^TM. A wide range of frequency is from 1.95Mhz to 16Mhz.The various color includes white, black and gray etc. And we also accept the order of customized production to meet customer's requirement.