FOBs are engineered & designed to fit common arrow diameters (4mm, 5mm, 6mm, and 6.5mm).  Sizing is based on your arrow’s diameter.

For more detailed information on which FOB will fit your arrow, please visit our Sizing & Setup page.

Yes, see the sizing page to check which size you will need for your particular arrow.

FOBs are not compatible with whisker biscuit rests. We recommend a dropaway rest, and we STRONGLY recommend limb driven dropaways. Here are a few brands that we use and recommend:

• Hamskea

• Trophy Taker

• QAD

• Vapor Trail 

• TRUGLO

This will be dependent on where your kisser button is on the string and the string angle that your particular bow creates. The majority of archers who use kisser buttons will not have an issue. That said, a lot of archers who prefer a kisser button find that the FOB itself acts as a kisser button.

There should be at least 1/16” of clearance between the FOB and your sight frame, arrow guide, arrow rest housing and launcher fork, bow riser, and cable guide. Please use the clearance tester provided and the instructions on the back of your package to check this.

First confirm that you’re getting contact on your rest by applying chalk, powder or lipstick to the outside of the FOB or to the outside of the vanes of a traditionally fletched arrow. Shoot this arrow and if it leaves a mark on the rest fork, you know that it is not timed correctly. It is common for cable driven rests to be improperly timed, which is why the use of a draw board to set up a cable driven dropaway is highly recommended! This is another reason we recommend limb driven dropaways, since they do not require timing and are "self-timed".

• Standard FOB – 24.0 ± 0.5 grains

• X-Axis FOB – 23.0 ± 0.5 grains

• H-Axis FOB – 24.0 ± 0.5 grains

• Micro FOB – 24.5 ± 0.5 grains

*** Note these are the averages of each size of all the colors. Each size has a slightly different weight, but you should expect to only see at most weighing in at 24.0 ± 1.0 grains per unit and +/- 0.4 grain variance in any given pack.

Try one or more of the following:

• Widen your d-loop by tying in nock points with BCY #3D string. If you do not have experience doing this, go see your local archery shop. Click here to see John Dudley teach you how to do this.

• Purchase longer nocks. For example, Gold Tip nocks are longer than Easton nocks. Lighted nocks are also typically longer than non-lighted nocks. NOCK OUT and NAP Thunderglo lighted nocks in particular will get rid of 99% of string clearance issues.

If none of the things listed above get rid of the contact between the string and the FOB at full draw, your Axle-to-Axle and/or draw length are creating too aggressive of a string angle to use FOBs. For more information, contact us.

Yes, all lighted nocks work with FOBs except Lumenocks. One thing to note when using the lighted nocks with FOBs is that they will pop off and stay with the FOB on a pass-through. So, lighted nocks will be pointless if you use them for the sole purpose of locating your arrow. However, reflective arrow wraps are a great alternative!

Please see the shipping and refund page.