Dubia Roaches are the perfect feeder. They are meaty and high in calcium. We love them because they are a long lived feeder and can't climb glass or plastic. They offer so much nutrition to our pets. We gutload all our feeders with organic and all natural vegetables and fruits. Sizes: 1/4" (Are great for hatchling and small pets) 1/2" (The most popular size. Great for medium size pets) 3/4" (These guys are 3/4" to 1". They are great for larger pets like chamelons or bearded dragons). *** Shipping**** Standard shipping is an average 2-5 delivery time. If you prefer a faster delivery time please choose 2 day or overnight shipping.