Helps eliminate peaking, iron tracking and cupping. Self-aligns tape and iron to seam center. Will not stick to pad. Works with any type of hot melt tape or iron. Solid Teflon base gives support for roller or pressing carpet into tape over spongy pads. Reduces operating temperature to eliminate fabric distortion, peaking, iron tracking, cupping, discoloration and secondary delamination. Gives you a higher quality seam in a shorter amount of time. Helps when working over cold floor surfaces.