I've recently ordered some silicon bits from them too via ebay.
I have to say, the silicon is not the same quality you get from silionhose.com (SFS Motorsport) or siliconhoses.com (Forge Motorsport) or Samco. It's thinner walled.
However it is cheap (you get what you pay for I guess), it'll do the job and the company are great to deal with. Quick response to questions and quick delivery.
All the silicon bits say "LOGPRO" on them so you might want to get some stickers to put over that too
maybe you could buy some from DK with the savings.