Profile: L B Plastics, Inc. designs and manufactures rigid PVC extrusions. Our diverse product offerings range from innovative solutions for the construction and remodeling industry to custom profiles designed to meet any specific requirement. Our products include Railing Sheerline ®, Fencing Sheerline® and window & door systems. Our Sheerline® is the #1 vinyl rail system, offering the most wood-like appearance of any vinyl rail system in the market.