the thing under it is like... silicone rubber. It's VERY hard and not like double sided tape. a blade is needed to take it off. i wouldn't recommend trying to pry it off by force because the shark fin is plastic and there's a possibility of cracking.
F30 335i 6MT// OEM blacked out grill// OEM matching reflectors// BC racing coilovers// Injen intake// M Performance front lip (ClearBra) // Gloss tinted Roof // Custom CF trunk lip // OEM blacked out rear diffuser, reflector // JB4 stage 1