Serenity Professional Light Wood 100% Real Pure Kolinsky Hair Acrylic Nail Brush Round:(Size: S02-S12) 100% Authentic Serenity Brand Kolinsky Brush. Our Brushes are made from 100% real Kolinsky hair. Note: All Size of Serenity brush will be different on handle S02 (size 12) S04 (size 14) S06 (size 16) S08 (size 18) S10 (size 20) S12 (size 22) Brush Care Tips: Proper use, together with correct care and cleaning will ensure your brushes have longer life. I hope the following tips will help. - Storage is important - always keep aired and whenever possible, in the upright position. Natural hair needs to breathe in order to prevent mould growth. Keep your brushes out of direct sunlight. - Try to keep handles dry, to prevent them from loosening and cracking. When you dip the head into liquid monomer or brush cleaner, try to keep the liquid level below the crimping and only wet the ferrule. - Moulting or shedding hairs from a new brush is a normal process. Once the brush is broken in and following a few application sessions the moulting will stop. Always thoroughly rinse a new brush with brush cleaner or liquid monomer before first use. - Always clean a good quality brush thoroughly after each processing session with brush cleaner or liquid monomer DO NOT USE ACETONE because Acetone will remove the shine from bristle make acrylic tacky and buildup residue. Remove as much moisture as possible with paper towel and reshape before storing. We ship everyday including Saturday