visibility and buoyancy: bright yellow EVA foam buoys provide floatation and visibility for marking pool lanes, fishing, or securing equipment, with buoyancy up to 650 g depending on size. Complete set with elastic rope: includes 5 hard foam buoys designed with elastic rope attachment, offering a long lasting and flexible solution for a variety of water activities and commercial fishing applications. Versatile use: suitable for creating swimming lanes, marking fishing net boundaries, or serving as anticollision markers for boats and docks, useful in both recreational and professional aquatic environments. Size and buoyancy options: available in 3 size variations (61*97*12mm, 73*105*20mm, 96*145*20mm) with respective buoyancy capacities of approximately 150 g, 300 g, and 650 g to accommodate different weighting requirements. Use scenarios: Create swimming lanes in pools or open water. Mark boundaries for fishing nets or gear in commercial fishing. Provide anticollision markers on boats and docks in marinas or harbors.