The SV84 is the medium size twisted side glow cable we offer and can be used in a wide range or projects. The fiber optic cable is 1/2 of an inch (12.7 millimeters) in diameter. Price and order quantity are in linear feet. Bulk pricing is calculated automatically by our shopping cart, the more you order the larger the discount. Side glow cable should always be used with at least a 150 watt metal halide fiber optic illuminator. If you want a neon type of look you will need a 250 watt metal halide illuminator.