Supplied by Plastofilm Industries (Wheaton IL) each half is thermoformed from 15-mil rollstock that's extruded from 100% post-industrial PVC. Draw depth is 3/4" for each half. Augusta GA-based Frigidaire uses the same clamshell for three lawn trimmer line varieties which vary in length and thickness. It replaces a hinged PVC clamshell. Sold nationwide under the Barracuda(TM) and Poulan PRO® Predator(TM) Line brands the lines retail between $2.99 and $11.99. "We had a couple of problems with our older package" admits Frigidaire's director of marketing Bob Morrison. "Most importantly it was difficult at times for our customers to get the line out and install it on their trimmers. That was the driving force behind our decision to change the clamshell. "Also the former square-shaped package required more labor" he explains. "After the product was machine-wound operators would have to position the line in the hinged clamshell put in a descriptive card and then close locking tabs." With the new pack the line is automatically wound onto a center spool. It's formed when the two halves are ultrasonically sealed on a machine from Branson Ultrasonics (Danbury CT). A small molded channel holds the start of the line. The clamshell is mounted onto a machine that automatically winds the line around the sealed spool. The outer circumference of the back is open; it allows the line to be wound through the opening. The end of the line is threaded through two small holes cut into a hang tab on the back side of the clamshell allowing consumers to pull out the line. To finish the package a Label-Aire (Fullerton CA) machine automatically applies a colorful pressure-sensitive label to the front.