Copper Care Wood Preservatives, has been an inovative leader in wood preservation science. Bringing to market effective, cost-effecient, lower-toxicity wood preservation solutions, systems and products to market for decades. Their Tenino Copper Naphthenate (with 2% metallic copper by volume), is the only end-cut solution available to retail customers that meets the requirements of the AWPA's M4 standard for field-treating end-cuts of pressure treated wood in compliance with Internation Building and Residential codes. Copper Care Wood Preservatives, concern for enviromental quality is demonstrated by their use of domestically sourced recycled copper and use of reclaimed by-products in Tenino Copper Naphthenate as well as meeting or exceeding low VOC (<350 g/L) regulations. Copper Care Wood Preservative's products are EPA registered pesticides. To help protect our enviroment Copper Care urges you to always read and follow all label directions when applying any of their products.