Gel Balls Buying Guide: Size, Finish & How Many to Buy

Most players spend an hour picking a blaster and ten seconds picking ammo. Then the first session ends early because the gel balls were the wrong size, half of them were lumpy, or someone soaked 500 when the game needed 3,000. Ammo is the cheapest part of the hobby and the part that decides whether your blaster feeds cleanly. Here is how to buy it properly.

What "7.3mm" actually means

Gel balls are sold dry. They are tiny, hard beads that swell when soaked in water. The size printed on the bag, for example 7.3mm on both of our refill bags, is the expanded size after a full soak, not the size of what you pour out of the bag. That is why a bag that looks like a pile of poppy seeds is fine for a blaster that fires something the size of a pea.

Two practical points follow from that. First, check that the expanded size matches what your blaster is built for. Most electric gel blasters are designed around this 7-8mm class, but always check your manual or product page. Second, size is only as good as consistency: a bag of balls that swell to a mix of sizes will feed badly no matter what the label says.

Frosted vs. milky: what to look for

You will see ammo sold in different finishes. Our two refill bags are Hardest Frosted (35,000 count) and Hardest Milky (50,000 count), both listed as 7.3mm expanded and non-toxic polymer. Rather than promise you one is magic, here is the honest approach: the finish matters less than how each batch behaves in your blaster.

Frosted and milky finishes also look different in flight and on impact, which is mostly a preference question. If you play at night or want to see where your shots land, test both and pick the one you can track.

Test a new batch before game day

1. Soak a small test batch. A tablespoon of dry balls in a jar of clean water is plenty. Our soaking guide covers timing and water in detail.
2. Sort the obvious rejects. Pull out anything misshapen, undersized or cracked.
3. Load one magazine. Fire it on a backyard target at a safe distance.
4. Watch for feeding trouble. If it jams, check your magazine and the balls before blaming the blaster. The magazine feeding guide has a symptom table.
5. Chrono if you can. A big change in velocity between batches is worth knowing about. See the FPS and chrono guide.

How many gel balls do you actually need?

Do the math from your group, not from the bag. The formula is simple:

players × magazines per player × rounds per magazine × reloads per session

Take an illustrative example, not a promise: 6 players, 2 magazines each, 100 rounds per magazine, 3 full refills across a session. That is 6 × 2 × 100 × 3 = 3,600 balls fired, and you should soak more than that because some will be lost, dropped or rejected. Your magazine capacity and style of play will change the numbers, so plug in your own. For a one-off backyard afternoon, a refill bag is far more than you need. For regular group days or a field you host, the larger bag starts to make sense.

If you are planning an event, the group game modes guide includes ammo math by format.

Storing dry ammo and soaked ammo

• Dry: keep it sealed, cool and away from moisture. Both of our refill bags come in resealable packaging, so use the seal every time.
• Soaked: soaked gel balls dry out and shrink if left in the open, and they can grow mold if left wet in a sealed container for long stretches. Soak what you will use within the session.
• Leftovers: do not tip them down a drain. See our yard cleanup guide for how to deal with them, including around pets.

Before you buy: a quick checklist

• Confirm the expanded size matches your blaster (7.3mm for both refill bags above).
• Check the recommended age on the listing (ours list 15+) and who will be playing.
• Match quantity to your real session math, not the biggest number on the page.
• Buy one bag first, test a batch, and only then stock up.
• Wear sealed eye protection every time you test, even in your own yard. Rules on gel blasters vary by state and city, so check local regulations before you play in public.

Good ammo will not fix a bad magazine or a weak battery, but bad ammo will make a good blaster look broken. Start with a test batch, keep notes on what feeds cleanly, and stock up once you know.