Petmate's bowls are made with natural bamboo, the surface of Bamboo Bowls contains visible traces of this sustainable material. Featuring an anti-skid bottom, these dishwasher-safe bowls are available in a standard or slow-feed design. Made from natural and sustainable bamboo material. Available in two colors: Olive Green and Earth Brown, please allow us to choose a color for you. Non-Slip and dishwasher safe. Slow-Feeding option helps dogs eat at a healthier pace.