It may lead to breakage etc. on the character of these goods and a product. Please be careful about the following matters. - This product is vinyl products. If air is put in superfluously， it will expand too much and will become a cause of breakage. - Please do not add excessive load to a product. It becomes a cause of a burst and breakage. - Please pour in after checking that the valve is open firmly， when pouring in air from an air valve. - Please do not extend the bonded part of a main part by force. It becomes a cause of breakage.