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Products DescriptionSpecificationJawLine Muscle Training Fitness BallBrand NameAncestorModel Numberancestor111GenderUnisexColorBlue/Purple/Black/Grey/PinkMaterialFood-grade Silica GelUsageJawLine Muscle TrainingPackingPP bagWeight25ghot sale face and neck exerciserhow to use: 1.to fit,first practice placing product and get the feel for how wide you should open your mouth2.Put product with biting strips in boiling water for 20-24 seconds3.Remove Jawline exerciser from boiling water, shake off excess water,but don't wait too long to let it cool4.Stick your thumbs through the hole,place and adjust jaw exerciser ball so you are biting down on bite strips5.Bite down and hold for 15 seconds to customize the mouthpiece to the contours of your own mouth6.Remove product from mouth and cool your imprints under cold water for a few seconds to permanently set imprintswe provide customized logo on product and color boxjawlineme fitness ballgood quality:gel balls for foodwhen you in gym or house, you can use this jawline fitness ballconvenient and helpful