Product Features: 
1.Material of rubber: NITRILE or NEOPRENE
Notice: Generally Nitrile impeller's performance is below 10% that of

neoprene
2.The inset materials: BRASS
3.There are 5 kinds of Drive Type:
   (1) Slotted Shaft Pin Drive
   (2) Key Drive
   (3) Double Flat Drive
   (4) Spline Drive
   (5) Spline Drive (Serration)

As you know, Flexible impellers are the most important part in

Flexible impeller pumps. We improve the impeller performance by

special surface coating, decreasing wear and tear so the impellers can

last for long time. We recommended you should change the impeller

every year. We can guarantee that you will have great satisfaction

with our flexible impellers.