Pure PTFE silicone tube from MAP, shaped with a unique curve to keep elastic central and allow it to be pulled from any angle. Incredibly lightweight, it enhances the life of your elastic and needs no bung or moving parts. Easy to fit, requiring a 7mm hole, and simple to re-elasticate your kit. - Pure PTFE - Unique curved shape - Incredibly lightweight - Keeps elastic central - No bung required - No moving parts - Easy to fit (requires a 7mm hole) - Enhances life of elastic - Elastic can be pulled from any angle - Easy to re-elasticate your kit