The Fivics pin nocks:
Are durable polycarbonate material that performs shot after shot
Fit all standard pin nock adapters
Sold in packs of 12
Available in small and large groove options (indicated on the nock with an "S" or an "L")
 
For more details about these nocks as well as other nock options, check out or nock guide.
 
Note: These nocks have previously been sold as "Soma Pin Nocks" by Carbon Express under their branding, but they have always been made by Fivics.