1. The Super E are butterfly type carbs with fully adjustable idle mixture screws ann changeable intermediate and main jets. 2. Easy to operate. 3. Material: aluminum 4. Size: 132mm 5. Suitable for Puch, Motobecane, Sachs, Garelli, Peugot, etc. (JOG50 JOG90 BWS100 RG50 DIO50-90, for 50CC-100CC.