New Van Alstine Electric Tire Siper, Sipe With Ease, Racing Tire Cutting Tool S-100 The Van Alstine S-100 sipers faster, easier, & with more control than ever imaginable Whether cutting simple sipes or creating complex siping patterns, the possibilities are unlimited Cutting open sipes with the #1 siping blade allows an extremely thin sliver of rubber to be removed adding even more flexibility to the S-100 siper As an added bonus, the S-100 easily cuts small grooves making this tool not only the perfect siper, but also an inexpensive but effective groover Ergonomic design