Physics - Electricity - Variable Resistance Many thanks for checking out our website. Below are a list of our on-line products.   Rheostat Tube Protected KST/EI/1281   Bulbs KST/EI/1282   L E D KST/EI/1283 Resistance & Condensers KST/EI/1284   Transistors KST/EI/1285   Bulb Holder With Bulb KST/EI/1286 Cotton Wire KST/EI/1287   Tin Wire KST/EI/1288   Bulb holder KST/EI/1289