360°
Art. IS251S		gr. 156 5,5 ozs	120 mm	yes	yes	yes	yes	no
Art. IS251M		gr. 179 6,3 ozs	160 mm	yes	yes	yes	yes	yes
Art. IS251L		gr. 203 7,1 ozs	200 mm	yes	yes	yes	yes	yes
Helix
Art. IS260S (patented)		gr. 145 5,1 ozs	120 mm	no	no	yes	yes	no
Art. IS260M (patented)		gr. 168 5,9 ozs	160 mm	no	no	yes	yes	yes
Art. IS260L (patented)		gr. 191 6,7 ozs	200 mm	no	no	yes	yes	yes