This item is 2 Part Flotation Foam for filling your boats hull. We HIGHLY recommend this to all our customers to keep your valuable R/C boat floating once fliped or stranded. These 2 bottles (6 oz each) when mixed together will produce 2.5 gallons (in volume once expanded) of foam. Simply mix equal parts of each bottle and the foam reacts & expands where ever you pour it, in about 2 minutes. This item will vary from picture. The containers you recieve will not be full. This is to allow for some expansion of the product.