Made of non-toxic medical TPR material.<br />Let veins and a head more mighty.<br />Size:length 5.3inches Dia 1.38 inches<br />When using more fitting soft skin.<br />Simple and easy to carry.<br />Use a little lubricant more comfortable<br />Attention:This sleeve is powered by 3 AG9 Battries，it is included，but it is not replaceable.