Enough length: the coral feeder comes in 13.77 inch/ 35 cm long, and the inner diameter is 5 mm, outer diameter measures 8 mm, enough length to arrive at deep and hard-to-reach area Quality and fish safe material: made of quality acrylic and rubber material, the sps feeder is safe for fish and corals, easy to clean, not easily get broken as glass and has long service time Simple, safe and clean to feed: with this acrylic coral feeding stick whose soft rubber suction does no harm to coral and fish, you can feed liquid phytoplankton to corals or other aquatic animals, which is easy to control and allows you to directly feed your filter feeders and timid fish while preventing your hands from getting wet