Thomson Feeders are very secure, easy to clean, food grade trays and professionally made. They come in Small, Medium, Large and Extra Large - Single, Double and Triple Feeders as per pics attached. Those of you that know and have used Thomson Feeders can appreciate the quality and workmanship that goes into them. The SL1 Small Single Feeder overall frame height is 135mm by 170 mm in width with a 150mm x 80mm deep bowl internal bowl measurements. Spare Bowls are available and can be ordered in our store.