The blue Tenura bottle opener is designed to help those with a poor grip to open and close bottles.This domed shaped design means it\'s suitable for most bottle sizes. Its ridged, soft handle provides a strong and firm grip when being used with either your fingers and thumb or the palm of your hand. This opener will come in useful for people with arthritis or any condition that weakens hand grip. It can be operated with one hand, with a Tenura non-slip mat underneath the base of the bottle to stop slipping and sliding.