Dome studs (half round studs) hot fix are being common now, popular size are 2, 3 and 4mm. It's dangerous products because the motif are easily changing its shpae during transportation if you don't use silicone mylar paper. Also, Many dome studs are NOT washable, especially when you apply to demin fabric. They may not pass even three time washing test. But when they are applied to t-shirt or sweater, normally they could pass 15 to 20 times washing.