The board's R7 construction means an extension of the classic 7-layer construction. With the R7, the glue is not water-based but with epoxy resin. This construction will make it lighter and stiffer!
The Liburty Slick Twin tail 8.38" is the Bobby Worrest pro model from Krooked Skateboards. The 8.38" deck is that size you might be wanting in your life, not too big not too small, throw in some twin tails and a slick bottom and now you will need this in your life.