The MX-Sensor 1-Sensor Bulk Box is a great option for those in need of quickly and easily replacing their tire pressure monitoring system (TPMS) sensors. With 20 individual TPMS sensors in one box, this product is ideal for bulk replacement. Each 1-Sensor features a combined frequency of 315MHz and 433MHz with rubber valve stems. The press release button allows for rubber or metal valve stems to be replaced interchangeably. Sensors are reprogrammable, 99% compatible with OE sensors, and meet SAE standards J1205 and J1206. Replacement valve stems are available for purchase in rubber or metal.