Thanks , going to take one to a shop and see what they say. Should have specified in post that I wanted spines for each bow not just one. Strung them up and wow. Went out and bought that 3 band bow exerciser. Going to have to up my bow strength if I want to shoot more than 5 arrows during practice. Going to master the 45 lber before even attempting the 55lber. Don't see myself touching it for at least a year. Truly understand why compounds are so much more popular. Take care.