Copied from Reel Weeds site.
LaDredge Outdoors has spent over 5 years designing this type of artificial weed, including hundreds of hours of testing in extreme winter conditions, improving what was not right, and building the perfect artificial underwater weed for fishermen and fisheries.
Although appearance and familiarity to fish is high on the list, quality, safety and durability exceeds everything else. Our product line has been custom designed and manufactured specifically with these factors in mind. It can withstand extreme winter weather conditions and is completely safe in our fisheries. We will cut no corners to provide to you the best possible artificial weed structure.
We caution anybody in constructing and/or submerging into our fisheries a homemade weed structure with products purchased from pet stores, craft stores, etc. Those products are in no way designed for this type of application, but simply intended and constructed for household decor, or heated aquariums.