The Roll-Line BLASTER is for the Semi-Professional Roller Derby Skater that wants to take their game to a new level with the same level of articulated performance as all of the upper level Roll-Line plates, but at an affordable price! The Roll-Line BLASTER Semi-Professional Roller Derby Skate Frame IS the same exact plate as the Roll-Line Variant M and provides the exact same great performance due to its innovative design and lightweight structure, only with the addition of an UPGRADE to Urethane Cushions and the Super Professional Amber Toe Stops AND choice between standard Roll-Line 7mm axles or more Derby Standard 8mm axles. The Blaster is forged from a solid bar of ultra lightweight and super strong aircraft aluminum alloy and is completely CNC-machined. The axles are made of the strongest steel available trucks feature adjustable pivot pins. The Roll-Line mechanism action adjustment system provides accurate click-action adjustments using 13mm base king pins with adjustment nuts and locking screws. Plates are sized according to wheelbase measurement (from centre of front axle to centre of rear axle) from 130mm to 190mm. If you aren't sure, please ask for advice on selecting the right size for your needs!