Flat Type Hop-Up Rubber Spacers by Prometheus. The hop-up tensioners come in a set with two different strengths. The soft version provides a soft response while the hard version responds precisely and can be fine-tuned. Both spacers ensure a long and consistent ball trajectory and better ball stability.

- Essential for flat hop setups.

- Creates a longer point of contact with the BB.

- Improved stability and accuracy.

- Soft and hard versions included for different BB weights.