Good quality extensions with hinged collar and pin adjustment system. Accepts euro (U Pin fitting). From top left to right. 1 Drop on extensions, available in 30cm or 45cm. 2 Reduced diameter extension. Base has 3 rollers and cleat. Available in 15; 30; and 45cms.Base has triple rollers and cleat. 3 Standard diameter extension. Available in 15; 30; and 45cms. Base has triple rollers and cleat.