to a drum stick 17 which may at times impact that edge during play edge 15 is shown preferably as rolled toward the outer side of the hoop and to extend downwardly at 15 a the reduced thickness edge terminal 15 c u2032 faces inwardly toward wall 12 below ledge 15 g with a small gap or opening 16 located between 15 c u2032 and wall 12 for water drainage outer side of wall 12 is shown at 15 b a typical thickness of wall 11 is about 2 millimeters preferably the edge portion 15 g that is rolled is of substantially reduced thickness at t 1 fig4 b leaving the main extent 12 a of wall 12 of relatively un reduced thickness at t 2 below ledge 15 g in fig4 and 5 fig4 b shows the flat strip of material 15 c and milling tool 90 positioned to remove material at 15 d leaving reduced thickness t 1 the length of 15 a of reduced thickness between 15 f and ledge 15 g locates ledge 155 above the level of terminal 15 f see also fig4 c showing hoop formation bending in direction 110 about the hoop axis with substantially reduced resistance to bending being.