Johnsonite - Tactile Warning - 24 in. x 24 in. Commercial Rubber Tile - ZephyrJohnsonite Tactile Warning 24 in. x 24 in. Commercial Rubber Tile Zephyr Tactile Warning Tiles, also known as Attention Tiles, are a tool for the blind or visually impaired, providing them with tactile cues to detect changes in level like steps, ramps, and escalators. Through these special hazards, TWSI Attention Tiles enable the visually impaired to navigate through their environment via the soles of their shoes. Available in 114 colors that are