Crafted from premium food-grade silicone,heat resistant,anti-aging and sturdy for long-lasting use, and reliable for daily shower. Size:Total length 8mm/0.31inch,suit for shower hole diameter 4mm/0.16inch Super easy installation with no tools required—simply pull out the old nozzle and push the new one in,quick self-replacement in seconds. Universal fit design,compatible with nearly all standard shower heads available on the market,great . Cost-effective repair part,solve the clog/aging problem without replacing the whole shower head,save your money and time effectively..