Nockturnal Helios Practice Vanes 6-Pack, S
Nockturnal Helios Vanes feature a breakthrough design that combines the simplicity of an instant-on string-activated lighted nock with a high-performance Aerofoil Vane for both high visibility and pinpoint accuracy. This design increases spin and is virtually unaffected by crosswinds.
Nockturnal Helios Practice Vanes 6-Pack, S Review
This practice balls is one of the best product around 29.99 ..It's from trustworthy Nockturnal, so you don't have to worry about bad quality.