The Ultra-ADA Pad Composite Model alerts people to a different surface than the surrounding concrete sidewalk when using a tapping cane. A flexible construction form fits dips, slopes, and inclines in sidewalks and walkways. Raised, truncated domes can be felt while walking. Available in four sizes: 2x2, 2x3, 2x4, and 2x5 ft. Ultratech International. 800-353-1611.