Micro fishing weights are small to very small split shot or other weights that will get your bait or fly down to where the fish are but aren't too heavy to use with very sensitive floats.
These are single size packs of #10 shot which is the smallest environmentally friendly non-lead shot I've found in the US. The #10 is just enough weight to make the tanago floats set properly and is also the right size for the Unibobbers.
What I find truly bizarre, though, is that while tin shot is widely hailed as being safe for the environment, each package has a label which says, in capital letters, "WARNING This product contains a chemical known to the state of California to cause cancer and birth defects and other reproductive harm."
So, I guess it's safe for the ducks but for heaven's sake don't apply the shot by biting it. I suppose you should wash your hands after you use it (assuming the water you're fishing in doesn't also cause cancer and birth defects in California.)
Realistically, the same warning should probably be given to people using lead split shot, and lead shot has been used for generations. I do sometimes wonder how we as a species could possibly have survived for four million years without having all those government warnings.
Like anything else, use reasonable caution and you should be fine.
The #10 shot are seriously small and I would recommend the Dr. Slick Spring Creek clamps for applying them. The jaws on the Spring Creek clamps taper to quite a point, which is what you'll want to grab and hold the very small shot.
The Dinsmore four-pack D4B has split shot in sizes 10, 8, 6, and 4. If you need a bit more weight than the size 10 shot, having the 4-pack allows you to choose the weight you need.
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TenkaraBum.com no longer ships to the UK. The new VAT regulations are too onerous for a one-man shop that rarely ships anything to the UK anyway. I apologize.
The USPS has suspended all shipments to Australia. UPS will deliver, but the shipping charge is more than $20 higher than the charge that will be calculated at checkout, requiring an additional payment.