Exotic Nutrition's O-Ring Syringes are of superior quality with EZ-Glide O-ring silicone gaskets that are super smooth and glide easily. Slip-Tip style syringes can be used with or without Nipples. Luer-Tip style syringes must be used with silicone or latex nipples (sold separate) FEATURES: ✔ OPTIONS - Available in 1 mL, 3 mL & 5 mL Luer-Tip Style sizes and 1 mL and 3 mL Slip-Tip Style. ✔ LATEX FREE - O-Rings are all latex free, and made with 100% pure Silicone Nipples fit the 1mL, 3 mL and 5 mL Luer-Tip syringes and the 3 mL Slip-Tip syringes. 1 mL & 3 mL syringes are available in Slip-Tip and Luer-Tip styles. 5 mL syringes are only available in the Luer-Tip style (use with nipples) WHAT SIZE DO I NEED? 1 ml - Suggested for: Baby Squirrels, Baby Sugar Gliders, Opossums, Baby Rabbits and other small mammals - birth to weaning. 3 ml - Suggested for: Small Baby Mammals such as Racoons & Opossums (4 weeks to weaning). 5 ml - Puppies & Kittens 3 weeks and older and larger mammal babies. DIRECTIONS: When feeding your animal, angle the feeder toward the cheek to prevent choking. Dispense slowly.