you have to mix the silicone rubber in your factory.
[24/Aug/2015 6:43:39 AM] Justin: For USD 3.3/KG, it mean the silicone rubber only.
[24/Aug/2015 6:43:52 AM] Justin: you have to mix the curing agent on your own.
[24/Aug/2015 6:44:22 AM] Justin: also, 3.3 usd doesn't include the curing agent inside.