1.clear body for identification of air bubble 2.smooth and sturdy plunger for traditional glass syringe feel 3.large wings and skid-resistant thumb pad for good grip and control 4.available at 1ml, 2-2.5ml, 3ml,5ml, 10ml, 20ml, 30ml, 50ml 5.Products Discription PAINLESS NEEDLE : Fully siliconized by medical grade