Within the category Sylvania Hi-Spot you will find different Sylvania light sources. Almost all Sylvania Hi-Spot halogen bulbs are dimmable. The Sylvania Hi-Spots are available with a GU10 base. The GU10 halogen bulbs are spots with 2 pins that are 10 mm apart from eachother. Always check when installing a halogen bulb which base fits in the fixture. Another base will not fit.