The dimension of the head :滚花的高度并没规定:也许有一通用的公司标准:maybe is one finger width ( about 20mm ) , maybe is one palm width ( about 100mm) . maybe is 0 mm , please kindly be informed : the head configuration is optional in the general nore ( 滚花头部结构是一选择 , 言外之意:它不是必需的。你还在乎它的高度干吗?