These longer, stiffer bumpers replace the existing bumpers on the MicroPlate Genie, Digital MicroPlate Genie Pulse Multi-MicroPlate Genie, and Digital Multi-MicroPlate Genie Pulse Mixers, to accommodate the taller PCR Plates. Please note that (4) kits are necessary for Multi-MicroPlate Genie and Digital Multi-MicroPlate Genie Pulse. If the serial number on your MicroPlate Genie is lower than M40-2075 you will also need to purchase Part No. 0K-0400-900 Shock Absorbing Feet 4 pk. If the serial number on your Multi-MicroPlate Genie is lower than M4K-1390 you will also need to purchase Part No. 0K-4000-900 Shock Absorbing Feet 4 pk.