1000x 4.5mm Standard Micro Rings. HairXtensions Micro Rings. Used with Stick-Tipped (i-tip) Hair Extensions or micro ring weft application, compatible with our 1.0 gram stick tip hair extensions. The small size and lightweight nature of the ring means they are very discreet and coloured coded to the colour of your natural hair. Size: Diameter. 4.5mm (3mm inner) Colour: Black. Qty: Approx 1000 pieces. Material: Aluminium.