Rosineer Bamboo Pollen Storage / Sifter Base Tray BoxRosineer Bamboo Pollen Storage Sifter Base Box consists of the lid and the storage chamber with tempered glass tray and is held together securely with magnetic pins. The box can be used for storing and working with your plant material or as a base box for using our sifter frames (75, 175, 275 microns; sold separately). When used together with sifters, just position your sifter frame on top of the storage chamber, add your material, cover with the lid,