Hongtu flash pre-inked seal has passed the testing of the Material Evidence Identification Center of the Ministry of Public Security of China, and has registered the product structure and appearance design patent, fully in line with the national seal product quality requirements. This is a kind of handle is hard sturdy slastic through Injection moulding, with toxic-free mineral oil and water, so that the cartoon doll floats on the liquid, so as to increase the ornamental and playability of the seal，making them fun children activities kids toys. This slow and soothing motion brings about a sense of calmness and relaxation for its observers for both adults and children. Suitable for special needs, AUTISM, ADHD Sensory Toys! Non-Toxic Materials! These liquid stamp are hugely popular amongst parents, practitioners and teachers who are faced with the challenges of supporting children with hyperactivity and relaxation needs! Proven to work, you must get your hands on one of these!Features: 1.Exquisite window, hard sturdy slastic through Injection moulding, with toxic-free mineral oil and water 2.Seal body stable design, using cylindrical oil injection hole, with simple brand flash ink pad and ink storage pad, make the imprint more clear and more durable. 3. This floating doll series pre-inked flash stamp is used in the ocean series, using clear liquid and blue liquid two, floating dolls can choose pigs, dolphins, seals, sea lions, ducklings, etc., shell color is white and pink. We can also customize different colors and floating dolls according to the needs of guests, or customize the colors and patterns of guests.