Easton Arrow Shaft X10 Protour (12 Pcs.)

The Easton X10 is a "tapered" carbon shaft to meet highest demands. "Tapered" in this context means: The front part of the shaft tapers slightly, so the diameter is smaller than in the rear part of the arrow. This is in contrast to the "original" Easton X10, which is "barreled", i.e. both ends are thinner than the middle.

The shape of the X10 Protour was specially developed for the compound. From a blog post by Easton from 2018:
 

Today, specialty designs such as the Easton X10 ProTour have been introduced with a reverse taper- with a more aerodynamic front, an overall smaller profile, and much stiffer rear portion, for better compound bow launch and downrange performance.  This design was proven by being used to set most of the existing compound bow world records, and to earn the vast majority of medals, from the time of its introduction a decade ago, through today.

While there are advantages to the tapered shaft, there are some trade-offs.  The main drawback of tapered shafts is the increased cost of production and difficulty in maintaining consistency, and therefore, the higher price, compared to parallel shafts.  The technology needed to taper an arrow shaft isn’t particularly complex- but on the other hand, maintaining excellent spine and straightness standards for a complete set of tapered shafts- much less every single one produced- is technically challenging and quite expensive.  In fact, this is where most of the added cost comes from.

The upshot is that the front-tapered shaft is, so far, the ultimate in performance for compounds shot with a release device.  Compounds don’t benefit from a more compliant rear shaft portion.  Finger shooters benefit more from a rear taper, which is more forgiving of minor release variation, and being lighter in mass, clears better on leaving the bow.  Notably, in the years before introduction of the ProTour, top compound shooters would use X10 Shafts with all or nearly all the rear taper portion removed.  Reo Wilde, among others, used this configuration to set numerous world records and win numerous World Archery world champion titles.  The ProTour was largely developed with this experience in mind.

Source: https://eastonarchery.com/2018/12/arrow-shaft-design-and-performance/

Key features:

• High-strength carbon fiber bonded to a 7075 alloy core
• 9-micron polished carbon finish
• Guaranteed straightness: ± .0015”
• Weight tolerance: ± 0.5 grains
• Components — sold separately

Technical Specifications: