Calculators, protractors, compasses and more! Look amazingly "acute" wearing our 1-inch wide elastic suspenders! Accented with nickel finger-clip attachments and metal crosspiece at the X-back, these are available in 2 sizes to fit most children and adults. Select 40-inch suspenders for average-sized children from about age 6 up to 5'5" tall; select 50-inch suspenders for adults 5'5" through 6'2" tall.