The Chinook Sailing 120-160cm Kid's Boom is our answer influx of kids to windsurfing. Designed with smaller riders in mind, the Kid's boom is perfect for future windsurfers wanting the same great innovations that their parents use. Designed with extra small 25mm / 1" grip. The thin walled 6070 marine alloy construction is light yet durable enough to make progressing easier. Cool graphics make it a boom they want to grab onto.