ROSEMARY & CO Reversible Pocket Brush - R3 - Pure Kolinsky Sable Pointed - Size 10 (6.4 x 27.7mm)ROSEMARY & CO is a family run business in England that makes these fantastic travel brushes for watercolour artists. Each brush is housed in a stainless steel case that you reverse out to make the handle of the brush and then close back up to protect the hairs when not in use. This is the R3 made on a larger handle and with Kolinsky sable fibre. Closed up the pocket brush is 13. 5cm long (~5") and when assembled 21cm (~8") from tip to tip.