The MX-Sensor 1-SensorM Bulk Box has 20 individually bagged, programmable universal TPMS sensors. The 1-SensorM features a combined frequency of 315MHz and 433MHz with metal valve stems. The press release button allows for rubber or metal valve stems to be replaced interchangeably. The 1-SensorM is reprogrammable, 99% compatible with OE sensors, and meets SAE standards J1205 and J1206. Replacement valve stems are available for purchase in rubber or metal.