The 3 in 1 Oil Applicator is a versatile scalp massager brush designed to promote hair growth. Made of silicone material, it features electronic stimulation for added effectiveness. The black brush is suitable for all hair types and has dimensions of 8.2 x 3.3 x 1.2 inches, making it convenient to use on the scalp and hair. This product is a must-have for anyone looking to enhance their hair care routine with a blend of massage and electronic stimulation.