These are Hair Extension extra-strength adhesive glue sticks. Hair Extension glue sticks work in Cool Melt glue guns. These are polyamide glue sticks suitable for most standard type of hair extension systems. . Adhesive SpecificationsHair Extension hot melt adhesive to be applied in low temperature glue guns. Bonds to porous and non porous material.SpecificationsSoftening Point: 257°F.Working Time: 10 secondsViscosity / Centipoises: 1,00-2,000 @ 375°F. (191°C.) Color: BlackFDA Food Packaging Approval: #21CFR175.105 Shape: RoundPounds and sticks per case: 12 sticks/ miniTemperature of Glue Gun: Low Temperature