Micro-Carrier Impeller Assembly Promote optimal growth of suspension and micro-carrier cultures. Impeller height adjusts through compression fitting in cap. Indented bottom up to 1L prevents accumulation of micro-carrier beads under impeller. Impeller assembly for micro-carrier spinner flasks. Consist of magnet holder, silicone plug, magnet, and ptfe paddle. Impeller size: 1-3l Paddle dimensions: 1 3/4" x 4 1/4" Consist of: Magnet holder: a523-207 Silicone plug: a523-200 (1 per EA )