It's really so convenient to use kite reel winder to fly your kite. There are many sizes for your option, from 8in to 10.6in. You can choose that according to the size of your kite. If your kite is no larger than 60in, then 8in kite string with reel is suitable. Instead, if you have larger kite more than 90in, then you need to use our 9.8in or 10.6in reel winder because it has brake mechanism. Kindly note the big kite string reel is fit for adults due to its heavier weight.