OD Vacula / Divall / XEX / TRF It is a bladder set that conforms to the damper. We gathered 3 types (4 each) of soft (blue), medium (black), hard (purple) into one set. The material adopts rubber system resistant to swelling and deterioration. It maintains stable performance for a long time. In addition, medium (black) corresponds to normal of Vacula / Divall.