These all-purpose hot melt glue sticks dry black and can be used in either high, low, or dual temperature glue guns. They are perfect for paper, cardboard, wood, and even bonding components to crossover boards. It works well on most porous and non-porous materials. Made in the U.S.A. Specifications: *Softening point: 178 degrees F *Open time: approx. 40 seconds *Color: black *FDA food packaging approval: #21CFR175.105 *Sizes: 7/16" dia. x 10" length.