visit the 'Superior Threads' website- they offer a vast amount of *free* information concerning needles & threads- along with charts you can print off & keep for future reference. they tell you about all the different types of threads, their properties, fiber content, weights, what they are best used for, what needles to use with what threads (and why) a great resource. if you feel you should tell the *quilt recipients* something--- I would just tell them- (if you notice anything coming apart- any broken threads after laundering- bring it back- I will fix it). or give them laundering instructions that will help preserve/protect the quilts. one way threads *especially cotton threads* break is when a wet quilt is hung to dry- the weight of the wet quilt puts stress on the threads and they break. but their are other factors- if the thread you used was a good, strong thread- and the quilts are laundered carefully they should last a long time- when making kids quilts/utility quilts that will be dragged round, used a lot, laundered a lot a good polyester thread is a good idea- it is stronger than cotton and will hold up better through the rough treatment. but, even cotton threads will hold up for a long, long time *look at how many beautiful 200 year old quilts their are in museums* - if the quilt is cared for properly- kept out of direct sunlight & laundered with care.