The wire keeper heads are not for everyone, but I like them. Some say it will tear the plastic up if you take the body off, but most keeper heads do damage anyway.
If and when they become popular, be prepared to pay extra for them. The small (crappie) jig molds use the WB400 insert and they sell for anywhere from 6.5 to 8.5 cents apiece which adds considerably to the cost of production.
Member Wally Marshall's Mr. Crappie Pro Staff