The Ermes Fighter Invert Roller Head is designed to fit speargun barrels with an inner diameter from 25.5mm to 26.5mm. This model comes fitted with ceramic bearings, for smoother loading. It can be used to convert a speargun to inverted roller system or to build an invert roller speargun from parts.

Compact and low profile head, allowing removal of rubbers to rear of speargun, improving manoeuvrability and tracking over both conventional loop band and roller speargun set-ups. Pulleys can also be incorporated into the invert roller configuration to further improve power and ease of loading.

This high-performance inverter muzzle is built entirely from nylon reinforced with 30% fiberglass, offering exceptional durability while maintaining a small and lightweight design for optimal underwater maneuverability.

There is an option for different wheel types - choose from standard delrin or upgraded titanium pulley wheels.

The male spigot has an O-rings and can have shooting line wrapped on the left or right of the muzzle.

Has an integrated stainless steel removable pin muzzle bungee attaching point that doubles as a reel line guide.

Key features:

• Material: Nylon with 30% fiberglass – lightweight and impact-resistant
• Inverter-ready design with central mounting points
• Pulley size: 30 mm, protected by a fairing
• High-speed ceramic bearings
• Dual O-ring seats for watertight barrel fit
• Compatible with 26–26.5 mm barrels

Perfect for spearfishers looking to upgrade or build an inverter system, this muzzle balances strength, precision, and hydrodynamic efficiency.