The HEVEA BABY BOTTLE is made from the highest quality, thermal shock resistant borosilicate glass. To help the little ones hold on to it, we have added a natural rubber cover, which not only helps the baby to grab the bottle easily but also helps the bottle from becoming slick. The unique HEVEA natural rubber STAR BALL also works as a breakage preventer, as it bounces off if dropped to the floor. The cover can be used as a toy when not used on the bottle.It comes with a natural rubber nipple, screw thread, cap, dust cover that has a measurement indicator on the side and HEVEA natural rubber Star Ball. The natural rubber nipple is size 0+ (milk & water).