G-Shock bands are matched to specific case model numbers rather than a universal lug width, so check the model number printed on the back of your watch (for example GA-100, GA-110, or DW-5600) and match it to that number in the product title.
Resin and rubber bands are the original style for most G-Shock models and hold up well to daily wear, sports, and water exposure. Metal bands give a dressier, more durable upgrade for models like the GA-2000 and GA-110.
Most resin band replacements use small pins similar to standard spring bars and can be swapped with a basic spring bar tool. Metal bracelet replacements may include their own sizing tool.
Aviation-series bands (GA-1000, GA-1100) are matched separately from the classic 5600/6900/GA100 lines, so double check your exact model number before ordering, since G-Shock case shapes vary significantly between series.