Thousands of children’s water bottles sold at L.L. Bean have been recalled due to a violation of lead standards. The recalled bottles were made by GSI Outdoors, Inc., of Spokane, Washington.

According to a news release by the Consumer Product Safety Commission, high levels of lead were found in the solder at the base of the bottles.

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About 6,700 units of the 13.5-ounce capacity insulated water bottles are affected. The bottles have the following color prints: Dino Bones, Flower Power, Orange Grid camo, Purple Tie Dye Butterfly and Robo Shark. The item identification number 297684 is printed on a sticker on the bottom of the bottle. Also printed on the sticker are “PO#844” and “BB2D2-LLB-R45-0413.” The bottles were sold exclusively at L.L. Bean retail stores, online at llbean.com, and in L.L. Bean catalogues from July 2015 through May 2016 for about $20.

Consumers with the affected bottles should immediately cease use and contact L.L. Bean at 800-555-9717 for a full refund.

The recall comes months after officials in Flint, Michigan, confirmed that the blood levels of children in the city rose after the city changed its drinking water source. Children are especially vulnerable to lead toxicity.