"The inner ring turns and releases for easy bulb changing. Far more practical than the usual spring clips, Square edged and thin for an inconspicuous appearance. bulb clips are around the edge of the bulb so not the most secure but more suitable for GU10 fittings. The only problem is the surface foil can delaminate with heat over time. I've had trouble with a couple over five years but I still prefer this light fitting so continue to buy them."