Arrma Mega/3S BLX Shock Cap. Package includes two replacement shock caps.  
Features:
Tough composite material for long-lasting performance and increased crash resistance in all conditions 
Precision manufactured to provide consistent fit of shock caps to your shock bodies 
High-quality o-rings included to ensure a leak-free seal between the shock cap and shock body 
Spare part for Alloy Shock Set (ARA330677 & ARA330678)
Includes:
(2) Shock Cap
(2) O-ring (11 x 1.5mm)