1、Rain Bird Rain Sensors： Replacement Hygroscopic Discs.For Rain Bird Wired Rain Sensors (Model RSDBEX & RSD)、Rain Bird No Bracket Rain Sensors (RSDCEX)AndRain Bird Wireless Sensors (All WR2 models) 2、Model RSDBEX & RSD Rain Bird Rain Sensors：Instead of throwing away the entire sensor, just remove the spindle and cap and replace the worn out discs with these 8 new ones. These discs are from a different manufacturer from the original discs that Rain Bird used. 3、Model RSDCEX Rain Bird Rain Sensors：This is a simple tool free fix that should take no more than 5 minutes.Brand New replacement hygroscopic discs for Rain Bird Rain Sensors. 4、All WR2 models Rain Bird Rain Sensors： Including 8 new Rain Bird Rain Sensors. 5、After-sale protection： If you are not satisfied with the product, we will provide you with a 30-day return and exchange warranty, Pls contact us first when you get some problem, we will offer you assistance asap.