This long version of spi-pole sliders is designed to reduce the side loads and torsion on the track. They slides on fibre inserts to reduce the friction to a minimum. Made for standard 32x6 and 40x8 T-tracks, they are always fitted with one upper and one lower block with becket for the control line. Single and double sheave end fitting for 2:1 and 3:1 systems are available. Antal offer a hard black anodized and teflon coated T-track that gives a lower friction coefficient.