Back Stroke Indicator 25M With Flags & Rope are posted near the end of the pool to indicate back-stroke swimmers that the end of pool has approached and they must stop.The backstroke flags are available in different color combinations. According to international rules for championships, back stroke indicators should be suspended across the pool at a minimum of 1.8 metre and a maximum of 2.5 metre above the water surface and shall be placed 5 metres from the ending pool wall. Proper markings must be done on both sides of the pool. Stainless steel posts are placed in floor anchors on the pool deck.