7M Rubber Speed Bumps are molded in natural rubber blended with EDPM rubber mixing of aluminum silicate, calcium carbonate, and recycled rubber. They are highly resistant to severe impacts and harsh weather conditions. The rubber is molded with hole metal washer. The molded design provides easy installation. The color Black and yellow material and UV stabilizer keep them perpetually colorful and clearly visible to the motorist during night hours. The speed bump is bonded with rubber adhesive with glass beads reflectors each for reflection.