Non-splitting, elastic, strong water absorption, firm tip.The surface of the UV pen is smooth.The pen is comfortable to touch and has strong adhesion.Suitable for gouache oil painting.Wear-resistant and tough.Material: woodSpecifications: 12 pcs/setProduct category: watercolor penmaintain:1. It must be put into water quickly after use, otherwise it will become hard. Make sure to never leave them in water and dry them.2. Cleaning: Water based paints - warm soapy water, oil based/solvent based paints3. Drying/Storage: Lay flat or head up.Package Included:1 *Paint materialIf you have any questions about this product, please contact me, we will contact you within 24 hours and provide you with a satisfactory answer.Please allow slight dimension difference due to different manual measurement.