I purchased several rods from outdoor suppliers. Most were ok, but took a lot of work and precision.
I went on line looking for better ones and luckily found your products. I started with the 3" rods, and they work great, especially with dryer lint. I recently purchased two of the 6" rods, assuming that the extra length will make it even easier.
I have one of your ferro rods in each of my winter coats, one in my glove box in my truck, one with my camping gear, one in my emergency bag in my truck...