...no one loves kite string or old tennis shoe strings anymore....=(Whenever I see a snare drum in a drum shop and it has plastic strips attaching the snare wires I know that the manufacturer doesn't really understand much about the product they are making or they just don't care and use the cheapest, easiest material they can find. Convenient for them and actually, convenient for me - I make drums and they make my customers.
One of the questions I get asked quite often has to do with snare wires not completely disengaging. "When I throw the wires off and hit the drum the wires are still slapping back.".
Plastic attachments act as springs. They never completely relax and so the wires are never fully released from the bottom head. It takes very little energy input to make the wires bounce upward and create that snare slapback. Apart from that, plastic strips have absolutely no flex. You want some flex to allow the snare set to move.
And while we are on the subject - stay away from that dam blue steel cable that Pures__t includes with their wires. That stuff acts like a cheese cutter on your edges and will eventually wear through the snare side head and chew into the snare bed. It is Purecrap and I have no idea why they still use that.
The best solution is 5/8" grosgrain (pronounced grow grain) polyester ribbon. You can find this almost anywhere - on ebay or at Michael's crafts etc. It costs about $3 for a roll that will last you years. It has some flex and it is exceptionally durable.