I have unbundled the kits, and now sell all the components separately.
For kids, I would recommend the Nissin Pro Square 320 6:4 rod, either the 2.4 for younger children or 2.7 for older children.
I would still recommend size 4 hi-vis fluorocarbon line. The brand doesn't really matter. I use them all interchangeably.
There are a few spools left of the Maxima 5X tippet, which was what had been in the kit
I would still suggest a pair of the round blue Tenkara Line Holders for line storage when you and your kids are not fishing.
For flies, all I can say is that I would very highly recommend fishing with flies tied on barbless hooks. Hooks are very, very sharp, and accidents do happen. If the hook is barbless, the accident is a lot less serious. Most people who are getting their kids into tenkara fishing already have flies. You can certainly use flies that you already have. If they weren't tied on barbless hooks, bend down the barbs as a safety precaution.
The flies sold on TenkaraBum.com are tied on NOT barbless. If you wish to use any of them when fishing with children, be sure to bend down the barb.
A kids tenkara kit just seems like a natural. Kirk Deeter of Field & Stream believes tenkara is the best way to teach kids fly fishing. I agree.
It may be that the "simplicity" factor of tenkara is overhyped, but when it comes to learning a new skill, simple is better. Casting is pretty intuitive. If you tell kids the goal: "see if you can get the fly over there," they'll modify their casting stroke on their own until they find something that works. It probably won't take very long.
Landing a fish is just as intuitive. Experienced fly fishermen frequently ask "how do you bring in the fish with no reel." A kid automatically just raises the rod and the fish comes in. Seen through a child's eyes, tenkara is indeed pretty simple.
Line control, certainly one of the more complex aspects of fly fishing, couldn't be easier. If there is too much slack in the line, raise the rod tip. That's line control in tenkara. Seriously! It really is that simple.
There are a couple points on which Kirk Deeter and I would probably disagree. First, I'm sure he sees tenkara as a stepping stone on the path to fly fishing. I think for more than a few kids it could be the end in itself. Many kids will go on to fly fishing, but I suspect some of those will come back to tenkara.
When they make the switch from tenkara to fly fishing, the number of fish they catch will probably go down. (Not having line in the water causing drag really is a dramatic advantage.) Mature fly fishermen and women may tell you it's all about the joy of being outdoors and that actually catching fish is secondary. For kids, many of whom are outdoors a lot anyway, it really is about catching fish.
Please note: all the photos of kids with rods on this page show the rods that used to be in the Kid's Kits. I have very recently found a new rod, but I haven't yet found a new kid to photograph with the new rod. Until people who have kids get the new rods and send in photos, that unfortunate situation will continue.
If fishing with a small child, be sure he or she does not put the tip plug in his or her mouth. It could be a choking hazard.
The hooks are VERY sharp. Please provide eye protection and adequate supervision.
I would recommend bending down the barbs on the flies. Some fish will wriggle off the hook, but if your child hooks himself (or you) it will make removing the hook much less traumatic.
I cannot list here all the dangers associated with fishing. However, studies show that most accidents occur at home, so to be safe you should probably stay away from home. If you're not going to be home, you might as well go fishing and might as well take your kids with you (saves on babysitters). I am sure all sorts of bad things can (and will) happen if you never go fishing.
Be careful. (That was adequate warning when we were kids. It ought to be adequate warning now.)