The THG Reptile Egg Incubation Tray is designed for use with small reptile eggs, such as Leopard Gecko, Crested Gecko, Uromastyx, etc. Packed with features: Four quadrants to separate different clutches, genetics, etc. Holds up to 8 eggs- 2 per quadrant\n- Numbered quadrants for easy egg sorting and record keeping. Easily and neatly stacked for storage. Fits in popular and easily found Fabri-Kal Alur 12oz deli cups. Raised bumps to help keep the egg suspended encourage air circulation. Can be used with a variety of substrates. Water can be added without disturbing the eggs. Super tight fit in the Fabri-Kal Alur 12oz deli cup to prevent injury to even the smallest hatchlings. Dishwasher safe (top rack only). The Reptile Egg Incubation Tray is designed to take advantage of suspended incubation techniques- minimum egg to surface contact with maximum air circulation around the egg. The Fabri-Kal Alur 12 oz cup is recommended for best fit, clarity and results (sold separately). We recommend NOT using pre-punched cups. Humidity and ventilation needs for different species vary so we suggest you start with two small holes and add as needed. A variety of substrates can be used depending on your preferences. Substrate level should be about 1/8 below the bottom of the tray. We have found vermiculite, perlite or water crystals work well with 2-4 small holes in the cup.