They have a hard and a soft material, both are normal o rings, but now come in two materials, both black. Both don't look anything special, but knowing creekwood they're really good! The bushings are a bit smaller in diameter than other bushings so you end up with less for the truck to hit against, and more ability to turn. The loose ones will let you glide around loosey goosey, and the hard ones are for those of us who like rock solid trucks. Something for everyone! As you can see from the pictures, even with the trucks tightened a bit the loose bushings still give loads of turn, so, I think they'll be a great product to use. And for $2 you cant go wrong!
Great stuff from creekwood, go check out their website and pick some amazing products up :)
www.creekwoodfbs.com